Being well versed in digital forensics, knowing the ways to break many popular methods, I was very skeptical when I saw your link/description. In my experience, there wasn't a good way to protect data on many smartphones (Blackberry aside, but many do that incorrectly anyway). After watching the video, that still holds true - this video merely recommends adding a passcode to your device as it's best advice. This is just a deterrent, since there are a number of ways to bypass such a thing. (Googling will give you plenty of info.) If a LEO wants into your smartphone, and has physical access to it, passcode or not (including advanced, not just a 4-digit pin), your data is theirs for the taking.