There is a lot of good advice here, so let me add a cautionary tale. I used to work for a local government as their “computer guy”. I got a call from a user who was unable to watch some video he had on a thumb drive. As part of diagnosing the problem, I logged in to his computer using my own account, copied the contents of the thumb drive to the hard disk, and played it from there. It turned out that playing the video worked from the hard drive and the rear USB connector, but not from the front. I told him this and closed the call, but didn't delete the video from his hard drive. I noted the call in my log, but didn't mention that the video was pornographic.
Much later, about a year after I my employment had been terminated, I got a call from the town's police. One of the detectives wanted to talk to me, and asked me to drop by the police station. It seems that someone had discovered that this user had been watching porn on his computer, and when they examined his computer they found that same porn on his hard drive, under my name. They gave me the third degree, wanting me to admit that I had been the source of the porm. I suspect they wanted me to be the scapegoat, since I was no longer an employee.
I acted calm, pleasant, truthful and stupid. They told me that I could be in big trouble if I didn't cooperate, and I responded by saying if I lied in order to tell them what they wanted to hear, in the long run I would get confused about what lies I had told, and get caught in a contradiction. Of course, it helped that they all knew me, so I had credibility when it came to being stupid. It also helped that these were small-town cops; I probably wouldn't last five minutes in an NYPD interrogation room.
This happened more than five years ago, and I haven't heard anything about it since.