There should be a national law to extend the DEA to administer Pro Sports Performance Enhancing Drug Abatement and to mandate that any Pro Sports athlete must sign away limited Constitutional Rights to participate in sports.
Horse Racing has all but cleaned up the sport from known substances albeit with exterme / Gestapo measures. Jockeys, Trainers, Grooms, Owners, etc. must agree to give up their Constitutional rights to participate in the Horse Racing. The drug tests are administered by staff salaried Veterinarians of the State of Kentucky. The samples taken and are handled solely by Detectives of State of Kentucky (with decades of patrol experience, college degrees). Ticket taxes and betting fees pay for this level of drug abatement. No taxpayer monies are used.
The key point is that corruption, and conflict of interest is minimized by the State. The state uses no interns, no volunteers, no university medical students, no athletes, no athletic department staff, no athletic federation employees, no meet / race staff. Every person who administers and handles the tests are State employees who have extended background checks and personal financial records reviewed on a yearly basis.