So the FBI, we now know, had a confirmed report that Cruz had posted a comment on a Youtube Video in which he claimed he was going to be a "professional school shooter."
The FBI claims they could not find the person.
This is a bald lie.
First, Cruz posted the comment under his own name. Second, every web property on the planet keeps web logs unless they intentionally disable them -- and Google most-certainly does not intentionally disable them. Third, it is this trivial to find out what IP number the post came from:
More @ Market Ticker