I talked to a SEFL driver and he mentioned his being "top of the line", sending it's info in via wifi, they adjusting the pressure from their office, but he did say he has to wear it 21 days out of the month, those here at AE said if they miss a day they are suspended until they show 7 straight days of using it. I know some that go home, put it on as they sit in a recliner and watch tv and set an alarm in case they do doze off, then they wake up and go to bed without it, others have family members wear it for them...... but once you are on it, you are stuck and have to use it everyday as long as you are with the job. Who really want's that over their head? Who wants to be told you MUST? Yes it may be better for your health but what if you go home and relax and fall asleep on the couch and forget one night? That just cost you a week's work and don't forget, AE charges the driver $500 for the machine, so yes, they force you to get the study, they push you to use that specific office in ckv (even though they have 9 middle tenn locations) and if you have it you pay $$ for the machine. If you choose to use a different sleep clinic of your own choosing you are suspended from driving until AE get's the test results back. I've watched a few deal with it.