Why do I have to take multiple DOT exams and UA's

I just had to take a physical well before finding out if I was going to be hired for a new job, and they're definitely not a mega carrier. They had their own forms though for the physical that had to be filled out along with the standard long form which is why they want their own. It was the first one I've had performed before at least showing up for orientation. Just found out today I got the job.

Their form was kind of nice though as it had most of the medical regulations in their forms. Makes it easier when I have to argue with a doctor about being deaf in one ear. Had a couple that tried to refuse to certify me for it, even though the regulations don't require hearing in both ears.