Sort of true sort of not...
if you as a witness OWN a business, such as a contracting business, you arnt allowed to work for a religious organization "AND KEEP PRIVLIDGES" (not yelling just emphasizing). If you are simply an employee of a contractor you work wherever you are told and its not your fault. Bear in mind the only "threat" is privlidges, not DF'ing or anyother official sanction. The exception is if there is a public safety issue, then a witness can correct the problem without threat to standing in the congregation.