Originally Posted by
docbert
This is no different to how countless public transport systems around the world work - including Caltrain. The onus is on the passenger to be able to prove that they have a valid ticket whilst travelling.
BART is normally different as the act of charging the fare is directly tied to using the gates, but in this case it's not.
Not to mention the chances of being accused of fare evasion during one of their crackdowns with people just waltzing through those gates.