Completely off-topic question regarding CSI

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Completely off-topic question regarding CSI (yes, the crappy TV show).

My wife loves watching this, be it the Las Vegas, New York or whatever the other one was.

Now, we in the UK have CSI, after all, someone's got to take prints and collect and analyse any evidence found. What truly puzzles me and this may be completely different in the USA, since when does a CSI carry a gun? Fingerprints are pretty unlikely to shoot you. Since when does a CSI interrogate a suspect? Here from what I can gather they are stuck in a lab analysing and writing reports. Since when do the CSI arrest people? Back to the previous comment basically.

Now, this may all be totally different in the States but I am just curious since she occassionally makes me sit through this drivel while eating and getting indigestion off the TV.

Maybe someone would be kind enough to enlighten me on this completely useless issue.

Thanks for any/all comments and have a great weekend.