I cannot speak for the FBI as I know little about them. But I have worked closely its equivalent in my country (Brazil). And one notorious fact that I learned i

I cannot speak for the FBI as I know little about them. But I have worked closely its equivalent in my country (Brazil). And one notorious fact that I learned is that the technical expertise of these guys is way behind what the public expects of them. People expect federal police and government investigation to be up to date with the newest technologies and hacker practices. They picture hollywoodian CIA command centrals with magical hackers that can do anything they want by typing a few matrix-like code on a command shell. But in reality, technical government agents have very little incentive to do their job well done. They just wanna get over it and go back home. As a result you have highly untrained personnel, who doesn't keep up with latest technology and will do the bare minimum to just not get fired. Their methods are always amateurish and easy to avoid if you're actually trying. I'd imagine the US is a bit better than my country in this regard. But I'd doubt that by much. I'm still sure that their technical skills are light years behind what the public perception is.