The claimant has a PO Box. The claimant has moved out of state or a distant city in the same state. The claimant's subjective complaints do not match the objective findings from co-workers or informant information. Claimant refuses to return to modified work, indicating he cannot perform the modified duties.
Excessive payment demands.
It makes no sense that the claimant has not improved. Provide as much detail as possible. Know your budget. Know your surveillance company. As with any industry, there are different opinions as to what will lead to a successful surveillance.