Suspended Michigan staffer Connor Stalions, who is at the center of the NCAA’s sign-stealing probe, purchased tickets in his own name for more than 30 games over the past three years at 11 different Big Ten schools, multiple sources told ESPN.

The scope of the University of Michigan’s alleged sign-stealing operation includes both video evidence of electronics prohibited by the NCAA to steal signs and a significant paper trail, sources told ESPN. Stalions forwarded the tickets he bought to at least three different people in different areas of the country, sources say, which hints at the breadth of the operation.

The NCAA is expected to receive video evidence this week of illegal technology used in scouting tied to tickets purchased by Stalions, according to sources. An opposing Big Ten school looked up in-stadium surveillance video from a game earlier this year, and sources said the person in the seat of the ticket purchased by Stalions held his smartphone up and appeared to film the home team’s sideline the entire game.

Sources told ESPN last week of an “elaborate” scouting system, and that appears to be emerging less than a week after Yahoo Sports first reported that the NCAA was investigating Michigan’s scouting. Stalions often purchased the tickets with his own credit card, according to sources. The sources added that tickets at multiple venues were bought via the online retailers such as StubHub or SeatGeek.