If you want to know if the person is arrested, the best thing to do is to contact the detective or police officer who has been doing the follow up work on this case. The prosecutors office is probably the last place to go to look for information at this point.
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The detective will probably let the victim know when the guy is picked up. You can always follow up with him to find out. They do not always tell you if you picked the right person out of the line up. They don't want to taint future line ups (which it really is after the first anyway) by telling you. The DNA evidence will be irrefutable. So don't worry if you picked the wrong guy. The defense attorney will attack this but the rest of the evidence will likely outweigh that with a jury (if the case goes that far).
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Once someone has been charged the district attorney's office is under an obligation to make the victim aware of any plea negotiations.
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