An employee who chronically calls in sick.

A claimant who says that they are not able to work or function due to an injury.

A spouse who isn't able or willing to account for certain periods of time.

Your son or daughter is seriously involved with someone you don't get a good feeling about.

An Activity Check may be your answer to what that person is really up to. 

True stories:

A young woman whose boyfriend was never around on the weekends and never invited her to his home, despite the fact that they had children together and had been in a relationship for nearly two years. An activity check revealed the boyfriend was living a double life, complete with a second girlfriend with whom he also had children.