(WGN-AM)- U.S. Rep. Mark Kirk will call for legislation Monday that would toughen drug trafficking laws regarding a highly-potent form of marijuana, with penalties of up to 25 years in prison for a 1st-time offense.

The law would target offenders who sell or distribute marijuana that has a THC content exceeding 15 percent, which is between 5 and 10 percent higher than average marijuana, according to Kirk's office. THC, or tetrahydrocannabinol, is the main active ingredient in marijuana.

Drug dealers are increasingly cross-breeding plants to produce high-potency variants of marijuana, which are called "kush" in street slang when they have 20 percent THC, according to Lake County Sheriff Mark Curran.


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"When you amplify the strength of it, you are increasing the harm to the system," said Curran, who supports the legislation, which would amend a federal law. "They are more dangerous behind the wheel of a vehicle. It's not a good idea to have people that messed up."

The U.S. Drug Enforcement Administration has reported that kush sells for as high as $600 per ounce--creating the same profit potential as crack cocaine, according to Kirk.

He will release more information during a news conference in Chicago Monday, where he will be joined by representatives from the Lake County Sheriff's Department, the Lake County Metropolitan Enforcement Group and Waukegan Police Department.