(CNN) The open-air drug markets of Baltimore are flush with new product this summer. The source, at least in part, is more than 30 pharmacies and clinics looted in riots following the death of Freddie Gray in police custody.

More than 175,000 doses of opiates and other prescription drugs were stolen and are now on the streets, according to the Drug Enforcement Administration. Enough Oxycodone, Suboxone, Morphine, Fentanyl and other drugs says the DEA to keep the city's drug users high for a year

In a city with a large heroin-addicted market, the influx of looted drugs is adding to the problems facing police and city officials already struggling to deal with a sharp rise in shootings and murders. Law enforcement officials believe the new flow of prescription pills will breed new addicts and more violence. Many of those addicts will turn to cheaper heroin from the open drug markets later.

In response to the city's plea for help, the Drug Enforcement Administration and other federal agencies are seeking to prosecute the leaders of gang and drug dealing organizations.

Demonstrators put their fists in the air during a protest outside the Baltimore police's Western District station on Wednesday, April 22.

Demonstrators put their fists in the air during a protest outside the Baltimore police's Western District station on Wednesday, April 22.

A police officer films protesters from the steps of the Western District station on April 23.

A police officer films protesters from the steps of the Western District station on April 23.

Members of the Baltimore Police Department stand guard Thursday, April 23, outside the department's Western District station during a protest.

Members of the Baltimore Police Department stand guard Thursday, April 23, outside the department's Western District station during a protest.

Protesters get into a shoving match with police during a march downtown on April 25.

Protesters get into a shoving match with police during a march downtown on April 25.

Protesters chase after a car as it drives in reverse after the rally on April 25.

Protesters chase after a car as it drives in reverse after the rally on April 25.

A protester throws a barricade at a bar near Oriole Park at Camden Yards after a rally on April 25.

A protester throws a barricade at a bar near Oriole Park at Camden Yards after a rally on April 25.

Protesters stand off with police during a march in honor of Gray in Baltimore on Saturday, April 25.

Protesters stand off with police during a march in honor of Gray in Baltimore on Saturday, April 25.

A woman abandons her car in the middle of an intersection as Baltimore Police officers clash with protesters outside the Mondawmin Mall in Baltimore on April 27.

A woman abandons her car in the middle of an intersection as Baltimore Police officers clash with protesters outside the Mondawmin Mall in Baltimore on April 27.

Baltimore police officers in riot gear look toward protesters near Mondawmin Mall on April 27.

Baltimore police officers in riot gear look toward protesters near Mondawmin Mall on April 27.

A police officer is carried to safety after being hit in the head with a rock during the riot on April 27.

A police officer is carried to safety after being hit in the head with a rock during the riot on April 27.

Police form a barrier between protesters and a burning CVS being attended to by firefighters on April 27.

Police form a barrier between protesters and a burning CVS being attended to by firefighters on April 27.

People lock arms and form a line opposing police at the corner of Pennsylvania and North avenues on April 27.

People lock arms and form a line opposing police at the corner of Pennsylvania and North avenues on April 27.

Police carry an injured officer from the streets near Mondawmin Mall in Baltimore on April 27.

Police carry an injured officer from the streets near Mondawmin Mall in Baltimore on April 27.

A mixture of milk and water rolls down a man's chest after he was pepper sprayed by the Baltimore Police April 27.

A mixture of milk and water rolls down a man's chest after he was pepper sprayed by the Baltimore Police April 27.

Protesters climb on a destroyed Baltimore Police car in the street near the corner of Pennsylvania and North avenues on April 27.

Protesters climb on a destroyed Baltimore Police car in the street near the corner of Pennsylvania and North avenues on April 27.

The remains of a senior center smolder on April 28. Riots broke out Monday, April 27, after Freddie Gray's funeral

Demonstrators stand in front of a police line and call for peace after a bottle was thrown on April 28.

Demonstrators stand in front of a police line and call for peace after a bottle was thrown on April 28.

Jerrie Mckenny, left, and her sister Tia Sexton embrace as demonstrators hold hands and sing the hymn "Amazing Grace" in Baltimore on April 28.

Jerrie Mckenny, left, and her sister Tia Sexton embrace as demonstrators hold hands and sing the hymn "Amazing Grace" in Baltimore on April 28.

Two women sweep up the streets in Baltimore -- reflected in the broken window of a storefront on April 28. See more photos of the cleanup efforts.

State Sen. Catherine E. Pugh embraces a protester while urging the crowd to disperse ahead of the 10 p.m. curfew.

State Sen. Catherine E. Pugh embraces a protester while urging the crowd to disperse ahead of the 10 p.m. curfew.

A community organizer later identified as Joseph Kent paces in front of riot police with his hands up during a curfew in Baltimore on Tuesday, April 28. Moments later, he was seen being arrested by police live on CNN . Kent's lawyer said on April 30 that his client had been released from jail. While some protesters defied the curfew and faced off with police, demonstrations Tuesday were largely peaceful.

A member of the National Guard stands outside Baltimore City Hall as protesters gather on Wednesday, April 29.

A member of the National Guard stands outside Baltimore City Hall as protesters gather on Wednesday, April 29.

A demonstrator celebrates in Baltimore the charges were announced on May 1.

A demonstrator celebrates in Baltimore the charges were announced on May 1.

Demonstrators march through the streets of Baltimore after the charges against the officers were announced May 1.

Demonstrators march through the streets of Baltimore after the charges against the officers were announced May 1.

Demonstrators celebrate the announcement that six officers were charged May 1 in Gray's death.

Demonstrators celebrate the announcement that six officers were charged May 1 in Gray's death.

Police in riot gear enforce a 10 p.m. curfew and clear Baltimore streets of protesters and media on Friday, May 1.

Police in riot gear enforce a 10 p.m. curfew and clear Baltimore streets of protesters and media on Friday, May 1.

Protesters march from the Gilmor Homes housing community, where Freddie Gray was arrested, to City Hall on Saturday, May 2, in Baltimore.

Protesters march from the Gilmor Homes housing community, where Freddie Gray was arrested, to City Hall on Saturday, May 2, in Baltimore.

Medics take a man away after police pepper-sprayed him on Saturday, May 2, in Baltimore's Sandtown neighborhood where Freddie Gray was arrested in April.

Medics take a man away after police pepper-sprayed him on Saturday, May 2, in Baltimore's Sandtown neighborhood where Freddie Gray was arrested in April.

Members of the National Guard board a truck at an armory staging area on May 3 in Baltimore. After a night of relatively peaceful protests, the city lifted a curfew , the National Guard is preparing its exit and a mall that had been a flashpoint in the protests has been reopened.

People hold hands during a rally at Baltimore City Hall on Sunday, May 3. The death of Freddie Gray, who died in police custody, sparked rioting in Baltimore and protests across the country

Gary Tuggle, who grew up in Baltimore's east side and worked as a Baltimore cop, says his agency has drawn a list of potential suspects. Before taking over the agency's Philadelphia office, Tuggle led the DEA's efforts in Baltimore. He allowed CNN to tag along for a first-hand view of the drug markets and his agency's effort to thwart them.

Back when Tuggle was a Baltimore police officer more than a decade ago, he recalls "the street purity of heroin was 2-5%. Today we are seeing purity levels up to 80-85% and then some cases, a kilo of heroin would cost $140-160,000. Today you can get it for between $65 and $70,000 so you see the economics of it when you have a level of supply and level of demand that uses that inventory its literally bringing the cost down and purity levels up."

According to the DEA, prescription opiates can go for as much as one dollar per milligram and it doesn't take long for users to run out of money to support their prescription habit, eventually turning to the imported black tar heroin from Mexico or powder heroin from Asia, which is much stronger and cheaper.

In the neighborhoods surrounding where Freddie Gray was initially arrested, more vacant homes are appearing, more shops are closing, which means "the drug dealers have the corners for themselves," according to Tuggle.

According to the DEA, the influx of drugs on the streets is inflaming turf wars between gangs and independent drug dealers who are competing for territory, which is vital to a drug dealer's revenue stream.

"In some cases you have the gangs taxing other gangs or independent drug dealers," Tuggle says. Other times, gangs feel their territory is being threatened, which leads to a disruption in the balance of power and "that's only going to lead to violence."

That partly, police say, explains the 42 murders in May, Baltimore's deadliest month in 15 years.

Signs of the fresh supply of drugs are visible, Tuggle tells CNN during a ride past Baltimore's heaviest drug-trafficked sections.

The alleys -- or "dips" as they are known to law enforcement -- where most of the deals used to go down are largely empty. Because of the thinner police presence in the area, they are free to operate in the open.

Photos: Cleaning up after Baltimore riots Photos: Cleaning up after Baltimore riots People help clean up a CVS pharmacy in Baltimore on Tuesday, April 28, the morning after riots broke out during protests on Monday, April 27. The unrest followed the funeral for Freddie Gray , who died of a severe spinal cord injury he got while in police custody. There were more than 230 arrests, 144 vehicle fires and 15 structure fires, a city official said. Hide Caption 1 of 13 Photos: Cleaning up after Baltimore riots Members of the community clean up debris on April 28 from the CVS that was burned and looted in the riots. Hide Caption 2 of 13 Photos: Cleaning up after Baltimore riots A neighborhood cleanup crew works to clear trash from the streets on April 28. Hide Caption 3 of 13 Photos: Cleaning up after Baltimore riots Caroline Byrd helps with cleanup efforts on April 28. Hide Caption 4 of 13 Photos: Cleaning up after Baltimore riots Volunteers help clear trash from a looted business on April 28. Hide Caption 5 of 13 Photos: Cleaning up after Baltimore riots A man sweeps the street as law enforcement officers stand guard on April 28. Hide Caption 6 of 13 Photos: Cleaning up after Baltimore riots Baltimore firefighters inspect a burned store on April 28. Hide Caption 7 of 13 Photos: Cleaning up after Baltimore riots People helping clean debris are seen in the reflection of a broken window on April 28. Hide Caption 8 of 13 Photos: Cleaning up after Baltimore riots Jason Park, left, and business owner Sung Kang survey the damage to his store on April 28. Hide Caption 9 of 13 Photos: Cleaning up after Baltimore riots Men wearing work gloves help clear debris on April 28. Hide Caption 10 of 13 Photos: Cleaning up after Baltimore riots Kailah Johnson, 5, joins her mother in a neighborhood cleanup on April 28. Schools were closed across the city. Hide Caption 11 of 13 Photos: Cleaning up after Baltimore riots Volunteers help clear the wreckage from damaged stores on April 28. Hide Caption 12 of 13 Photos: Cleaning up after Baltimore riots Employee Sam Wirtz, left, surveys the damage to his store that came during the unrest on Monday, April 27. Hide Caption 13 of 13

In one neighborhood of row-houses about two miles from the tourist attractions of the Inner Harbor neighborhood, it's not long before cars come to a stop in front of two pedestrians engaged in an alleged drug deal in the middle of the road.

"Twenty-five years ago when I grew up here, you didn't see open air drug deals," Tuggle said. "That was something you didn't see, you had to go into the alleys to find those deals. Today as you've seen, it happens in the open."

In some areas, the presence of the DEA agents in unmarked cars are quickly noticed.

"Five-O," some called out. Lookouts immediately alerted the dealers and customers to the presence of law enforcement. Some were kids, agents said, as young as 10 years old paid $50-$100 a day to ride their bikes on corners and whistle at the first sight of police or suspicious, unmarked cars.

JUST WATCHED Active Baltimore police officers speak on riots, crime Replay More Videos ... MUST WATCH Active Baltimore police officers speak on riots, crime 02:08

Agents say drug users know which parts of town are best for heroin or other drugs: from the Sandtown area, with a booming heroin market, to the streets outside the historic Lexington Market in downtown, where prescription opiates have shown up, according to agents. Agents say the drug users are easy to pick out because of their tell-tale "nod," some leaning over precariously without falling over during their high.

Outside a methadone clinic, teeming by 8 a.m., the streets and alleys were buzzing. Agents say at least some in the crowd were dealers and users either attempting to ween themselves off the opiates, or immediately selling daily methadone dose for a quick buck to spend on more heroin.

Tuggle says that law-abiding residents of areas most affected by the drug dealing are victims of drug users who come from all over the region. The DEA is now circulating pictures of up to 70 individuals they say are directly responsible for the surplus of looted drugs.

"At the end of the day these communities have very, very decent people, hardworking people who want to work and educate their families and support their families. But at the end of the day you would see what I call piranha. A lot of these people dealing in these neighborhoods are not from these neighborhoods. Some of them have nice homes in the suburbs or they live in high rise apartment sin downtown Baltimore. So they come into these communities to take advantage of these communities."