Comment by aquafox

Every cyclist has a powermeter and the power is recorded. Why not require them to upload the power file directly after the race? Since they all ride the same course, you can correlate power output with speed (taking riders height and weight into ac ount) to spot outliers. I know there's drafting, differently aerodynamic bike setups and other factors to consider, but in principle I guess a sudden 20 watt external power gain could be detected that way.