Under the proposal, it would be illegal for retailers to sell guns without being certified by the state. To qualify, stores first must be licensed by the federal Bureau of Alcohol, Tobacco, Firearms and Explosives. Then, they would have to submit a copy of that license to the Illinois State Police, along with an affidavit declaring it remains valid. Shop owners would have to install surveillance equipment, maintain an electronic inventory, establish anti-theft measures and require employees to undergo annual training.