Criminal Law Questions? Ask a Criminal Lawyer.
If you were on a private computer, not a work or goverment computer, then someone would have to know what you were viewing and notify the police or file a complaint in order for it to be brought to the attention of the authorities.
Get a program called Drive Scrubber and if you see anything that is questionable on websites, close your browser, clean your cookies and your history.
You should be fine.
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