Today about one third of the inmates are incarcerated for repeated fare evasion.
Moreover, there has been no rise in fare evasion at the other stations.
"But they charged him with fare evasion, and he didn't do that."
But a prepay system, he added, would encourage fare evasion.
The advisory committee, she said, has estimated that the agency will lose about $100 million this year from fare evasion.
Slightly more than half the increase has come from a greater number of arrests for fare evasion, according to the police.
Last year, 140 people caught for fare evasion in the district were later charged with weapons possession as well, he said.
Stopping fare evasion may not be as easy and will likely take a while.
Last year Boris told me that fare evasion was running at £55m a year.
If fare evasion has increased it is, in my experience, due to a more rigid and less common sense application of the rules.