With paper Muni fast passes going the way of the whalebone corset come April 4, the beeps of accepted or rejected Clipper cards will grow ever more ubiquitous for train and bus passengers.

Along with the cacophony, will a new, frustrating way to be dinged for fare evasion emerge? If one pays for a monthly pass, yet forgets to tag in, can he or she be ticketed or not?

The answer, frustratingly, is “yes.”