The investigation revealed that the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) employed rogue tactics in undercover storefront strings in Milwaukee and across the country, including using those with mental disabilities to promote the operations - and then turning around and charging them with gun and drug crimes. The investigation found ATF agents set up operations near schools and churches, allowing them to arrest people on more serious charges; let felons armed with guns leave the fake storefronts; paid such high prices that people bought guns from stores and then quickly sold them to agents; bought stolen goods, spurring burglaries in the area; arrested and charged the wrong people; and drew in juveniles by allowing them to play video games, smoke marijuana and drink alcohol; failed to employ sufficient security, allowing sting storefronts to be burglarized; carelessly handled sensitive documents containing undercover officer's names and vehicle information; and left behind damaged rental properties, failing to pay landlords for repairs. In Milwaukee, an ATF agent's guns were stolen, including an automatic machine gun, which has not been recovered. The sting operations were part of an ATF initiative meant to go after “the worst of the worst” and target areas beset by violent crime. But in the Milwaukee operation and elsewhere, the defendants largely had nonviolent criminal backgrounds. Even a federal prosecutor criticized the ATF for the kinds of people targeted.