[slinkyavenger]

From what I've read in the past, it doesn't cover your thumbprint. [1]

Thumbprints are physical, so they don't get the same protections. It's kind of like having a physical key to a physical lock. It's not self-incrimination for law enforcement to take that key and use it in the lock.

Same with writing your passcode on a piece of paper. It's no longer a matter of self-incrimination if they find that and use it.

[1]: http://arstechnica.com/tech-policy/2014/10/virginia-judge-po...