Penny! Good to see you, friend!
My longtime involovement with legal authorities in various forms, plus my even longer-time love of mystery books (and probably action movies, as well), makes my first thought (since as theFF said, no context was given) was people who deliberately make themselves untrackable by any governmental agency: work and pay for everything in cash, never use a credit card or their social security number.
Kind of a tangent (gee I'm setting a precedent Jackie), but I recently read a real-life horror story about people who have postponed paying for something until a collection agency is called; then they pay it off but by that time the collection agency has sold their name/info. to another collection agency, and they then have to try and prove that they've paid...and that this can sometimes go on for
years.
