Police arrested an Ohio man who exchanged drugs for sexual access to children of drug-addicted parents and took sexually explicit photos of the girls to create child pornography, according to an indictment made public this week.69-year-old Larry Dean Porter repeatedly traded drugs for sex with three girls. He had several other adults help him transport the victims to his home. Police say one of the victims was only 7 years old. Porter both raped the girls and filmed himself raping them, U.S. Attorney Dave DeVillers said Wednesday.Occasionally allegations come along that call into question “our confidence in humanity,” DeVillers said. “This is one of those cases.”Numerous sources in Scioto County in southern Ohio told the FBI that Porter “was involved in sexually abusing minors, and that such abuse was occurring with the consent of the minors’ parents who were receiving illegal controlled substances from Porter,” the complaint said.Two of Porter’s adult daughters, are accused of trying to hide evidence by taking key material to a storage unit so investigators wouldn’t find it.The abuse began in 2013 and continued until this year, DeViller said. The investigation is continuing and there are believed to be more victims.Nine people were charged in total.