> Kids or coworkers are not going to make fake fingerprints to mess with me.

Don't underestimate the lenghts some people will go through for a harmless prank. But you are probably correct a modern phone's fingperprint-reader is probably not fooled by an etched stick of gummibear.

Incidentally - I always wanted to have a device that you could stick your finger into, that would use a, let's say, laser to etch different fingerprints onto the tip of my finger.