"The state may not limit persons of majority age from engaging in lawful expressive conduct protected by the 1st Amendment of the United States Constitution without a substantial and direct connection to adverse secondary effects, a showing that has not been made," Callahan said in the declaratory judgment.

Under the law, signed in July by Gov. Matt Blunt, seminude lap dances would have been banned and dancers would have had to stay at least 10 feet from each other. Customers would have faced misdemeanor charges for tucking money into a dancers' G-strings, and the minimum age for dancers and customers would have risen from 19 to 21.