When you hear the phrase “person of interest,” the first thing that may come to your mind is the now defunct TV series by that name that ran for a number of seasons in New York and across the country. It was a very dark drama based on the premise that “you are being watched” by the government and others whose supercomputers track you down so government officials can do you harm.
In real life, there may be no supercomputers tracking your every movement, but if law enforcement officers or a district attorney names you as a person of interest in a criminal case, you could make a good argument that they are out to do you harm. At the very least, they are not your friends.