No. P&T has phased out the BART Ticket Program in 2018-19. Please read this alert
However, if you qualify, the Clipper START Program can make your commute more affordable. Clipper START is a program for qualifying low-income riders, which will grant you 50% off of not only BART, but a discount on all of the transit agencies that use Clipper (ex: Muni). Find more information on the Clipper START website.