The U.S. Attorney's office for southern OH said more information about the charge that is being unsealed will be released at a news conference Monday afternoon.
Ethan Kollie, 24, of Kettering, was arrested Friday night in Beavercreek on suspicion of a firearms violation unrelated to the Oregon District shooting, according to Montgomery County Jail records and an unsealed complaint signed by a federal agent.
Kollie allegedly told federal agents that he regularly used marijuana and psychedelic mushrooms, which he grew at his apartment, and he routinely took "micro-doses" of mushrooms because it provided him with energy and it was "fun".
U.S. Attorney Benjamin Glassman stressed there is no allegation that Kollie intentionally participated in planning of the shooting.
One of the suggestions for new laws that's gained steam in recent days is known as "lie and try", and it would encourage more prosecutions of people who attempt to buy a firearm knowing they are banned buyers.
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Betts was shot dead by police after killing nine people in downtown Dayton, including his 22-year-old sister, in the early hours of August 4. More than 30 others were left injured, including at least 14 with gunshot wounds, hospital officials and investigators said.
Glassman added there's no indication Kollie knew he was assisting Betts in the Oregon District shooting. Agents interviewing Kollie at his apartment said they smelled marijuana and saw a bong and the Draco pistol in plain sight.
Betts retrieved the items about six to eight weeks ago, the Federal Bureau of Investigation said. The drum magazine arrived about six to eight weeks ago.
Kollie was charged with possessing a firearm as an unlawful user of a controlled substance and faces up to 10 years in prison.
Kollie allegedly told agents he lied on ATF Form 4473 while purchasing firearms, specifically while answering question 11e that asks, "Are you an unlawful user of, or addicted to, marijuana or any depressant, stimulant, narcotic drug, or any other controlled substance?"