The CTA is losing millions of dollars because of the fraudulent use of Ventra cards.
The agency is cracking down on people who are taking advantage of free or reduced-fare rides.
Federal and state laws allow seniors and people with disabilities to receive Ventra cards at a discount or free.
But a recent audit by the CTA found many of those cards are not being used by the authorized card holder.
1,800 cards have been confiscated over the past several weeks.