New Jersey State Police said heroin seized in Middlesex County last month tested positive for the pesticide Carbaryl, which can cause loss of coordination and involuntary convulsions.

"As if there could possibly be one more reason to never, not ever, not even once take heroin, there's yet one more: Pesticide," State Police said in an announcement on their Facebook page.

Authorities said the substance was found in three separate brands of heroin in December, labeled "Level 10" with an image of syringes in purple ink, "Miracle" in red ink and "Top Chef" with an image of two butcher knives in red ink.

The pesticide was found alongside other substances more typically mixed with heroin.

Discovery of the pesticide is the latest in a slew of substances authorities have found in bags of heroin in New Jersey recently. Fentanyl, an opioid several times more powerful than heroin, has been found across the state in 2014 and 2015.

Last month, NJ Advance Media revealed that at least 128,000 are addicted to heroin in New Jersey, and more than 5,200 have died since 2004.

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The drug could cause complications in addition to the inherent danger of using heroin. Carbaryl, commonly sold under the moniker "Sevin," is a popular pesticide most commonly found in home gardening and agricultural products and is listed as a likely carcinogen by the Environmental Protection Agency.

Carbaryl exposure can occur through skin contact, inhalation, or ingestion and adversely affects the respiratory and central nervous systems.

According to the state police, symptoms of exposure may include nausea, stomach cramps, diarrhea, and excessive salivation. Other symptoms of high dosages may include sweating, blurring of vision, loss of coordination, and involuntary convulsions, the state police said.

Administration of naloxone, a drug used to counteract the effects of a heroin overdose, will not counteract the symptoms of pesticide consumption.

Stephen Stirling may be reached at sstirling@njadvancemedia.com. Follow him on Twitter @sstirling. Find him on Facebook.