Verifying sick calls reminds me of being at a regional.

At my particular regional they got very nasty about it. I flew with a Captain who surpassed the 4 allowable sick calls in a year mark and was put on termination warning. The only problem was he was hospitalized with a chronic condition and all the paperwork was in but someone missed it. Anyways, they called him to HQ for a big beat down meeting, he got a labor lawyer, they weren't ready for that one. The end result was a lawsuit for harassment.

Helps when a friend of the family is a labor lawyer.