Why?
Why? Because it's not so easy to prove murder for someone who's a druggy, right. Being on Zoloft doesn't make him a druggie but when he's found with other drugs in his system it could make some people think he may have been on other drugs too.
Granted it's only an idea i throw out there. And i understand you like facts, cold hard facts. But sometimes there are parts of the puzzle missing and those are the pieces i try to find. Ok most of my theories aren't worth the finger strokes it took to type them. But sometimes i hit on something. This is probably one of those crackpot ones.
But way back i raised the question of whether or not it's possible that they used a substance on Anna that would be undetectable at autopsy (i remember that because i got the idea from an old movie that was on TV the night before and someone else chimed in that they had watched that movie too). Beyond that that theory didn't raise any eyebrows so i dropped it. I also raised the question way back of Anna possibly being detoxed in FLA. That didn't get anywhere either. Sometimes thinking outside the box is a useful tool in conjunction with the cold hard facts.