I added the gif-set to the OP
You know what? The episode really freaked me out, too... Do you really think that's possible? Somebody faking someones DNA? At least those parts they are testing for identification...
Yeah, at the end I recall Red waiting in Meera's apartment and her returning home and admitting that she was the mole.
I was suspecting her already.
You know what's strange? If she really was a mother and coming home late at night, where were her children and her husband or the father to the kids?
And how wasn't it strange to them that Red took her and she didn't come home for a night or so?