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Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by kens on Tuesday February 25, 2014 @02:13PM (#7299728)
Looks like it risks $250 fine for:

(2) Misuse of a transfer, pass, ticket, or token with the intent to evade the payment of a fare.

See California Penal Code 640(c)(2) http://www.sacrt.com/penalcode.stm

Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by oh_sigh on Tuesday February 25, 2014 @02:32PM (#7299862)
But neither user that swaps is attempting to evade payment of a fare - they are both paying fares at the end of their trip.

Of course, a judge would probably laugh at you and find you guilty in 15 seconds with a "logical" argument like that.

Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by dragonwriter on Tuesday February 25, 2014 @02:41PM (#7299910)
> But neither user that swaps is attempting to evade payment of a fare - they are both paying fares at the end of their trip.

They are attempting to evade (part of) the fare for the trip they are actually taking.

Re:A Twitter Data Scientist Hacks San Francisco's Subway Fares by placeybordeaux on Wednesday February 26, 2014 @12:57AM (#7303206)
Person A is evading paying one fare and paying a seperate one which they were never asked to pay.