Federal labor law may be the answer, Search on the fed definition of work related task, I cant remember where but what I found long ago was that any task related to work is to be paid task it seems to me that at one time because of my employer Insisting that controlled substances ( meds) be counted by in coming staff and outgoing staff but they refused to pay for it so if you arrived at 10:55 pm and out going shift ended at 11:00 pm and put that five minutes on your time card and punched in at 10:55 they still refused to pay it. One coordinator adjusted many of her sites shifts to run 10:45 pm to 8:45 am in order to make sure that the overnights got paid for med counting. What my employer does with mandatory annual training is if your a 40 40 employee they adjust one shift down so they do not pay OT for the training so say with 9 shift 72 hour position the 32 hour week is when they would schedule the class . So see what you can find then you will have to figure out how high up the chain you want to take this issue , Do keep records of every training attended and if they have sign in sheets id suggest taking a pic with your phone after you signed in. ( you know , your printed name signature site info and name of the trainer and hours of the length of training and if it has trainers name too.