Is Any Of Horse Racing Rigged? If So How Much and What Parts?

 I believe that certain trainers find drugs that are not yet being detected and use them for a while.  Scott Lake, Wayne Catalano and others. (Milkshakes were popular until they started testing for them.) When they get caught once they usually get off with a fine or at most, a 6 month suspension.  On the smaller tracks I feel like the trainers "know" which one will win and often you will see 5/2 morning lines drop to even money or 4/5 on the winner.  Everyone in the know, KNEW.  Some of the trainers don't bet but a lot of them do, it is the only way they can make a living where the purses are small.

Harness is fixed!!

    I know trainers jockeys track officials etc. They all at one time or more have cheated for their own financial gain.
Even the cashiers can register a bet for a patron they don't like.
Bet at your own risk and never bet more than you can afford to lose.
If you know the"insiders' don't ask for favors.It can come back to haunt you.

There is cheating in racing and all kinds of sports when betting is involved. Money rules in the end. The cheaper the racing event the more likely some cheating going on. I feel there isn’t much jockey cheating (trying to lose) so that leaves drugs and medication. I take the opinion that most trainers get the horse ready as best they can, drugs or no drugs. You can analyze percentages off claims and other angles to help predict which trainers moves are best for whatever reason. Best game in the world to gamble on to me