So when we came across a tree streaked with bright purple paint, I didn’t assume it was modern art or my long-hoped-for ...

Several US states have the 'purple paint law' in place. The paint can be used by land and property owners like a 'no trespassing' sign.

If you spot purple paint on your early morning hike, it might be best to turn around and find another route, because you might be trespassing. Many U.S. states abide by the "purple paint law ...