Seems a simple answer to me - require every rider to have 3 - 5 uniquely identifiable bikes. Require that all rider's bikes - irrespective of position, etc. be

Seems a simple answer to me - require every rider to have 3 - 5 uniquely identifiable bikes. Require that all rider's bikes - irrespective of position, etc. be kept by the race organiser at the end of the day. Randomly select bikes for testing with x-ray/millimeter rays, electromagnetic sensors, and even destructive testing. An extended "post race parc fermé" if you will...