it would poison the used phone market in general. I'm currently using a Nexus 5 that I got via a craigslist transaction. Even if the phone came from the origi

it would poison the used phone market in general. I'm currently using a Nexus 5 that I got via a craigslist transaction. Even if the phone came from the original buyer, how do I know the college-aged seller didn't put on the spy software for the lulz?