A new procedure should be put in place at high profile races that I care about. Have teams of qualified folks to give each rider a full body scan, for needle marks. If they are micro dosing, surely they must have some highly visible needle marks? Check their arms, check their legs, check in between their toes, everywhere!! And please video tape it as the "pre-game" show before each TdF stage... oh and swab suspect areas with alcohol pads to remove any coverup cream.