The change to the TAP card system began on August 8, 2012.
What is TAP?TAP is Los Angeles County's new fare collection system that replaces paper passes and frees you up from hauling around exact change. Think of your TAP card as a "transit fare wallet". You must load a pass and/or cash value onto the card in order to board using a TAP card.
Read more about the TAP card on the site above.