but for brian questenberry, it's the perfect place to do that. >> some people enjoy golfing, fishing.oy finding these fraudsters. i get a sense of satisfaction. it's figuring out a puzzle, a mystery, solving it. >> reporter: his targets, covid relief fraudsters. people and businesses that allegedly knowingly violated the $800 billion paycheck protection program meant to allow struggling businesses to keep paying employees during the pandemic. >> i'm looking for low-hanging fruit. something that's straightforward. double-dipping, for example. i found some who would get two loans in the first round, two loans in the second round, you can't do that. >> reporter: questenberry scouring public data looking for loan applicants he believes broke the rules. >> that bothers me. that's my tax money, your tax money. >> reporter: if the government takes on one of his cases and succeeds in clawing back money, a percentage goes to questionsenberry. ppp, paycheck protection program, was one part of a $2.2 trillion bill called the c.a.r.e.s. act, signed by president trump in 2020 in response to the co