If all correspondence is done on the phone and not through email. I communicate through writing much better than on the phone so I wrote long and explicit emails. I don't feel like I have anything to hide. The phone only people are the ones who go back on their word.

The other thing is one size fits all NDA / non compete contract. Maybe it makes sense for the sales people but for writing code every day inventing things it doesn't make sense for the employee. If people don't want to take the time to write an appropriate NDA / non compete contract I have no time for them.