Not like 'I hope there is a storm the 15th of May'.
whoever wants to know where they are can sample DNA from as many relatives as possible, surreptitiously.
Nanopores can be made with dielectric breakdown of a thin piece of etched wafer.
Low input current noise op-amps can be used to measure the nanopore signal.
A dedicated skip tracer will find you through environmental DNA.
Not like 'I hope there is a storm the 15th of May'.