Edited sentence: Also, doubling-up, two persons going through the gate with activation by one card, caused the gates to freeze open.Although BART knew of these defects before installation, they were silent on the issue until disclosed by the local media.In October 2010, it was discovered that the toll gates could be operated by waving a hand in front of a gate sensor.In addition, and from the inception of the system, the elevators intended for use by the handicapped were often utilized by the San Francisco homeless as both their bedroom and latrine.It was BART's intention to get around to removing these defects over time.New turnstiles to accommodate the new transit payment cards presented significant problems.There was no integration of these elevators with the fare collection system, and they are frequently used for fare evasion