Why go through all the effort of spying on someone when you can just send a drone? Private investigators have begun doing just that, using the flying robots to document subjects, acquire evidence, and close cases.

“People want you to believe there’s all this negativity associated with drones . . . but they could be a very helpful tool,” Olwyn Triggs, president of Professional Investigators Network Inc. in Glen Cove, LI told The Post.

Triggs used a Phantom 2 vision quadcopter to resolve an insurance fraud case, crediting the 2-pound, foot long drone with uncovering the truth. “You need to think outside the box when someone’s acutely aware,” she said. “That’s when you’ll consider using a drone.”

Other companies also tout the merits of using a drone in certain reality-TV-friendly situations, from catching wayward spouses to recording unstable parents during a custody battle. But laws governing drones are still murky, and although the units are small, a drone can easily cause major problems for airborne vehicles (or vice versa, as the case may be).