Wife’s New Job Is Making Her Pay For Training

My wife recently started a new job at a memory care retirement home. Her position is not in the medical field, but they still want all employees to have first aid/CPR training which makes perfect sense to me.

What doesn’t make sense is that they are requiring my wife to pay for the training, and she is not being paid for the hours she is attending the training. I’ve received CPR training several times and it has always been paid for by the company, and on company time. Am I wrong in thinking that it should be her employer who is responsible to pay for the training? I’m in Washington state. Thank you