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I am sorry to hear about this situation. Unfortunately, at this point, someone in your situation cannot simply "recant" the statement. What happens is that the police can use this statement in their investigation, and then when they pass it on the prosecutor, it is the prosecutor who makes the final decision as to whether or not to charge the individual.
What someone in your situation can do is to contact the police and to offer another statement explaining that whatever you had stated earlier was exaggerated. However, this risks the possibility of the police charging you with false statements. So this is risky. What is better is if he is charged, to work with his defense attorney and to let the prosecutor know that you would not be a "willing" witness for the prosecutor on the stand.
The prosecutor needs a witness to get a conviction most of the time, since the onus is on them to prove the case beyond a reasonable doubt. If someone in your situation would be a "hostile witness,' the prosecutor is more likely to drop the case and/or to make a plea deal.
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