How to 'extract thc from plant material to make hash oil'.
If your house was raided and they found significant amounts of hash oil within a week or so of your searching for it...it is somewhat damning.
I get what you're saying though. I'm not sold on Internet searches as "proof" of a crime. But in the publicized case that we're all talking about, it's just one of many pieces to the puzzle that the investigators and prosecutors were trying to put together.
I've said it before...I wasn't a juror, or an investigator or a prosecutor or a defense attorney. With the amount of "evidence" that's been presented to me, I can't make a call on it one way or the other. But in the eyes of the law, since the jury found him guilty, he's guilty...at least until some new evidence can be presented in his appeals.