2 police detectives showed up to my house for cyber crime yesterday.

I got a knock at the door at 9 am, that was expected as it was an incall to fix an iPhone.

About 10 minutes into the repair I get another knock at the door, 2 policemen (1 white cop, 1 black cop) that identified themselves as detectives. I wasn't really alarmed initially because I wasn't aware of anything I had done.
They asked me some questions and fielded me out, I pressed into them on what this was all about?

They started off by asking me if I had made a craigslist post about asking for any Iowa State University for their netID, which I had over 4 months ago. I told them I didn't get any responses from that. Which made me go through and investigate craigslist's policies:
From:https://www.craigslist.org/about/privacy_policy
I pressed them on how they get craigslist data but they wouldn't tell me. I'll have to be careful about those personal ads I've put up from now on.

They then asked if I did get any students to give me their ID, which I had. I discounted a girl to give my macbook air wifi access, as it's pretty much everywhere on campus. I told them that I only used it for light browsing and studying if I was on campus, I like it that they have the library open until 2 am now. One of my things is I like to hang out around town at specific spots with coffee and read newspapers and certain books.

What startled me is that before they showed up they had thoroughly investigated me, I'm not fully versed in police procedure but I'm guessing this is so they can catch me in a lie and therefore know quickly if I'm the guy as surprising people throws them off.
I also assumed they were just fielding me out as had I done anything the girl I got access from would have been contacted and she would have known it was me and they would have shown up to my door that way.

It's a little old but I think they were fielding me out for something around this: Iowa State University Data Breach

They said tax information and records were continually being pulled. They kept asking me questions about bitcoin, blah blah blah. I told them they have lots of information that's readily available and that they sell over 30k student emails for $20, which I had bought; they told me they knew I bought that list and emailed it.
They kept asking me questions about my repair business and wanted to see my parts, I showed them and happened to be right in the middle of a repair. Eventually they were grasping at straws.
I was told to forward the name of the person who gave me access so they could investigate the internet activity.

I shook hands with the man I did most of the talking with and they took off... I was a little shooken up but realized I made a big mistake! I forgot to shake the black police detective's hand... shit!!!

After I was done with the customers in my house I quickly sent them the necessary information on who had given me access and when (down to the hour almost), I haven't even used the internet access for over 6 weeks anyway. I told them I would only use guest passes now. The only reason I wanted someone's ID was because they are good for up to a year and I wouldn't have to register with different emails and I think they disallow multiple signups from the same MAC address on the computer.
They emailed me back thanking me for my cooperation.

For the most part this incident was me just making decisions that, based on my background, didn't look that good. I don't have a criminal record whatsoever but they discovered I have some tech background. Makes me wonder what porn stuff they found on me...

...Meanwhile I've been busy all day today putting all of my crazy porn in cascaded layers of encryption, fucking preparing for a raid mutha fucka!!!... lol... joking... largh largh largh