screened so tricare could be billed, others working with cockerell labs set up a makeshift clinic in this strip mall just a mile from the gates of fort hood. we have learned that beginning last summer and running all the way through this past february, soldiers would line up by the dozens every day in this parking lot and provide their d.n.a., urine, and tricare i.d. numbers in exchange for a $50 walmart gift card. >> it was a lot of people. it was full. >> reporter: linda bozeman, the wife of a soldier, told us she visited the clinic a few times last year to make a little extra money for christmas presents. >> they just said that they had this clinical research going, and that they paid you by walmart cards so that you would give your urine. >> reporter: but it wasn't for research. documents show cockerell dermapathology used linda bozeman's samples to bill tricare 418 separate times,