Most Missed Tackles by DB's Over the Last 3 Seasons:
Rank - Name - Number of Snaps - Number of Missed Tackles
9th (tied) - Charles Godfrey - 2718 - 35
9th (tied) - Sherrod Martin - 2308 - 35
Worst Tackling Efficiency by DB's Over the Last 3 Seasons:
Rank - Name - Snaps - Tackles - Assist - Missed Tackles - Percentage of Missed Tackles
1st (tied) - Asante Samuel - 2460 - 93 - 7 - 37 - 3.7%
4th (tied) - Sherrod Martin - 2308 - 123 - 28 - 35 - 5.3%
8th (tied) - Chris Gamble - 2674 - 130 - 7 - 30 - 5.6%
I included CB Asante Samuel because he's the Falcons new CB, and many here wanted the Panthers to trade for him.
Godfrey and Martin were no surprise, but Gamble was, so I checked NFL.com's player stats, and they don't match up. They have Gamble with 119 tackles and 19 assist, but the total is only off by +1. I also checked Martin's numbers, and they show 127 tackles and 49 assist, +25, so make of it what you will.