TAP Cards will Replace Metro Day Passes in March
The colorful day passes that were released just a few years ago will be a thing of the past starting next month. As of March 15, the $5 fare for day passes will be on the new electronic, reusable and refillable TAP cards that were previously only available for monthly and weekly passes. With these, you can pre-load up to eight days worth of day passes. And until April 11 or as supplies last, the $2 cards will be free when you purchase a day pass on a bus (the machines at train or Orange Line stations will not disperse them yet, but you can load money on to them there).
As for using TAP for single rides, it is unknown when that function will be released (we're awaiting an answer from Metro and will update this post when we know).