About their experience, specify what kind of experience and if they were paid. I'd go on to ask if they were ever terminated from a position,as well as if they have any references
Most are just checking to see what they can get not actually wanting to dedicate working one on one care. I believe they would rather be paid through a facility.
That sounds extremely uncomfortable. id wonder why does this individual only accept cash. Then ask for background information.
Definitely call your local APS report abuse, ten call police for theft.