Kenneth Curtis never wanted to go to jail for being the guy who sells urine so people can beat drug tests. He just wanted to fight for privacy rights.

But Curtis will find himself before the state Supreme Court today, asking justices to throw out his conviction and six-month sentence for breaking a state law against selling urine.

Prosecutors say the case is simple: Curtis knew the law and broke it when he sold urine and a kit containing a heat pack, tape and tubing so it appears a user is giving his own sample.

The purchaser two years ago turned out to be an undercover State Law Enforcement Division agent.

Curtis’ main argument is the SLED agent testified he never told Curtis he was going to use the urine to beat a drug test because he feared Curtis would not sell him the kit.

Curtis’ lawyer also plans to argue that the judge in the case should not have allowed testimony about an Internet pornography site Curtis’ Web site was linked to.

State law says it is illegal to sell urine with the intent of defrauding a drug test. Since the agent did not say what he planned to use the urine for and Curtis does not market his product as a way to beat a drug test, the justices should overturn his conviction, Curtis said.

In its brief, the state attorney general’s office said Curtis’ Web site left no doubt the intention of his product, and his business card includes the statement “pass any drug test guaranteed.”

Curtis, 44, acknowledges most workplace urine testing is for drugs and alcohol.

Curtis no longer sells urine at his Internet site. Court battles have forced Curtis to move his business to Hendersonville, N.C.