Prosecutors decided not to appeal a court ruling that disqualifies video evidence allegedly showing Robert Kraft, owner of the New England Patriots, paying for sexual acts in a Florida massage parlor. Was the police surveillance justifiable? Not exactly.

As more companies begin specializing in the art of straight-to-your-front-door service, one company wants to do more than stand idly outside. Zeel wants to come in. An in-home massage service, Zeel...