But Bill's and Tracy's point is well-taken ... most likely whoever planted the evidence was not the Carver.
I'm really torn on this point. If it wasn't the Carver or someone in league with him, are we to assume that the British cop did all this
just to get back at Christian for his dumping her? I've heard of some jilted lover revenge plots that are pretty extreme before, but fictional embellishment aside, this would have taken a lot of work on her part. Plus, from a fictional standpoint, it would have gotten her expelled from her job (which she still may be); from a real-world standpoint, if she was responsible for framing Christian on her own, the character should not get any sympathy from the audience.
Even the worst characters (as far as morality goes) have had some redeeming quality, no matter how small. All we have seen from her is "ice cold bitch" and "psychotic revenge woman", so in my eyes, there is nothing to redeem her.
And come on, saving a condom for what had to be several weeks since their last sexual encounter? On the revenge side of things, that shows some pretty extensive premeditation and/or the fact that she is still with Kimber on the side; on the hygiene side of things, well, ICK.

I'm sticking with Liz on her own, or Liz with help from Kimber. Either way, I'm dying to know how it all turns out.