FORT LAUDERDALE, Fla. — Alison Kessler told police she was suspicious when her son’s father, John Stacey, seemed to know that she had paid a visit to the courthouse. She didn’t see him following her. How did he know? When a mechanic found a tracking device stuck to the underside of her car, it made sense. Kessler went to the police and accused Stacey of planting it. It would have been that ...