I definitely had a thing where I had a medical issue that didn't allow me to come in my last two weeks of work, plus I was already moving soon. Because I didn't finished the last two weeks of my work I actually ended up being blacklisted, even though my work knew I had dental surgery before that affected me being able to come in.

Thing is its still pretty hard to prove your cause without:
1: visual or audio proof via cameras and such
2: getting past "right to work" which an employer could just find some other excuse to fire you
3: Union busting if you needed protection because of of what is already said in number 2 that needs number 1 to support claims to begin with.

I think the overal workforce rules generally need an overhaul catered more to the workforce rather than the management of any particular companies.