I'm curious to know how the contractor's have handled any crimes/intent to commit a crime while reviewing the recordings. What's the policy in such a case?
One would have to ask Apple for their policy--and I doubt they would tell you. Obligations would depend on state law [in the US]. My understanding is that generally speaking you don't need to report a crime although, in some states, there are exceptions for certain felonies [serious crimes--e.g. you witness a murder].