> if you make it to the point where a judge is listening to you, he/she won't be sympathetic

Do you have any evidence for this? Courts routinely suppress evidence.

> and filmed himself placing drugs?

I saw the video; it's bad and it's an injustice. No one was convicted of a crime in this case, though I suspect others likely plead guilty in similar circumstances given their incentives in our current system.

But why does that affects your decision to lock your phone? Are you worried police are going to illegally compel a fingerprint from you and then put something on your phone?