She could forge a letter from the prosecutor saying that there was no need for an exam because the case was nolle prossed. The problem is when the forensic exam

She could forge a letter from the prosecutor saying that there was no need for an exam because the case was nolle prossed. The problem is when the forensic examiner sends in a bill, unless they are on a retainer and don't have to submit timesheets. One issue not addressed is scale. Law doesn't scale. A prosecutor with more than 500 cases will have difficulty staying on top of them all; if you had to deal with Google or Twitter numbers (tens or hundreds of thousands) you wouldn't notice if a case disappeared off your docket.