Unfortunately in these DV cases only the prosecutor can decide whether or not to drop charges. The best thing you can do at this point would be to assist your brother in hiring a local criminal defense attorney who has experience with domestic violence matters. Once you hire him a good attorney the attorney will know how to handle the situation.
I will be happy to speak with you at no cost with a FREE phone consultation if you have a San Diego or California matter. Please call my office at 619-238-1905 or visit my website at www.lawofficeofwilliamdaley.com
Typically in Broward County, the Domestic Violence prosecutors will not drop the case until the day of trial, if and only if there are no witnesses and the victim doesn't show up. Handling cases in Ft. Lauderdale, I have seen the State try to introduce statements by the defendant and/or victims through 911 calls. It is in your best bet to hire an experienced domestic violence attorney to help you in your case. Review my website to see if it answers any questions you may have.
This is not a do it yourself project. You need an attorney. A domestic violence conviction can drastically affect your life.
There is no confidentiality online. Volunteering to answer this question does not create an attorney-client relationship. The accused is presumed innocent until proven guilty beyond a reasonable doubt. The likelihood of a positive outcome- exoneration or a mitigated sentence- is increased with the help of an experienced criminal litigator. Seek out an experienced criminal litigator for a free consultation. If you cannot find one on Avvo, search at the National Association of Criminal Defense Lawyers (NACDL.org) Speak to several attorneys and hire the one that makes you feel confident and comfortable. NACDL local members: http://tinyurl.com/8ru8wtv
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Short answer - no. The case will not be dropped at calendar call. Whether it will be dropped on the trial day depends on the specific facts and evidence in your case. Prosecutors in domestic violence cases are faced with the situation you describe in almost every case and that is why they are not willing to just drop charges because the victim does not want to prosecute. You need to talk to an attorney about this.