What's described as a "super-strong" drug that's mixed with heroin has New Jersey law enforcement on high alert - just as some agencies in the state report that overdose cases have spiked this year.

Police departments and prosecutors in the Philadelphia region, Camden and Monmouth County, among others, are on high alert for the drug after the Drug Enforcement Administration reported that W-18 could have entered area's heroin market. Indeed, nine pounds of the painkiller were seized by Canadian authorities in April, prompting an Edmonton doctor to tweet this: "To put in perspective, this is enough to kill every man, woman and child in Alberta about 45 times over."

Some New Jersey authorities say they have not seen the drug in the state so far, which apparently is 10,000 times more powerful than Morphine - so powerful that law enforcement can't assure that Narcan will reverse a W-18 overdose. But Charles Webster said the drug, which may be undetectable to current standard opioid testing, could still be in New Jersey.

Just as medical professionals have surmised that W-18 could be spiking overdoses in the United States, Webster said Monmouth County has had a 50 percent spike in Narcan saves this year over 2015. Chemicals such as fentanyl are also mixed with heroin, he noted, which could also be contributing to the problem. But Webster said the Monmouth County Prosecutor's Office is on alert for W-18.

"Just because we haven't seen it [W-18] doesn't mean it's not out here," said Charles Webster, saying the number of Narcan saves in Monmouth County has increased from 87 at this point last year to about 130 in 2016.

Al Della Fave, a spokesman for the Ocean County Prosecutor's Office, also said his agency hasn't seen it although there's "nothing law enforcement can do to prevent its spread." He said the prosecutor's office is usually notified when a new drug enters the market.

W-18 is likely manufactured in underground Chinese laboratories, and the Drug Enforcement Administration is telling local police departments, and the drug remains unregulated, according to NBC Philadelphia. Physicians, citing a recent Drug Enforcement Administration bulletin warning, told The Philadelphia Inquirer that they believe the synthetic opioid is so powerful that it can cause death in microscopic doses.