what lindhback had stumbled upon was a lucrative income tax scheme run by inmates at the jail in key west. before the bust the inmates filed for more than $1 million of tax refunds involving half the jail population. >> what they would do is go to other inmates and suggest to an inmate, i can get you $4,500 in a tax return. it will cost you $500. >> reporter: in some cases with the help of friends and family, the prisoners would fill out the 1040 ez short form, then attach a 4852 form with the names of businesses that didn't exist and income they never earned. the 4852 is a substitute used when an employer doesn't provide a w-2. the initial investigation handled by county prosecutor john ellsworth. phone calls were recorded. >> one of the main guys at one point is telling one of his cohorts that he's not going to