As previously stated, more information is needed. My guess is that there had to be evidence for the police to get a search warrant for your house unless you consented to a search. It is possible you allegedly engaged in trafficking on a date different than the search. That you possible sold to a CI or undercover officer. Again, more information is need. I would urge you seek counsel as soon as possible to protect your rights.
This can be charged as a felony domestic violence assault since she has one prior domestic violence assault conviction in the last 10 years. As a felony she is looking at jail time and probation. She needs an experienced criminal defense attorney.
It is difficult to answer this question without knowing the strength of the prosecutions case, the facts, and complete history of your brother. However, I can offer you the following:
Maine law provides a court “shall state in the sentence of imprisonment whether a sentence shall be served concurrently with or consecutively to any other sentence previously imposed or to another sentence imposed on the same date. The sentence shall be concurrent unless, in considering the following factors,...
Your friends best move is to hire an attorney. Most jurisdictions do negotiate either the sentence or the level to the charge (felony/misdemeanor). You need to contact local counsel to determine if the value of $400 makes it a felony
The answer to this question s best decided between you and your attorney based on the facts of your case. As a general rule if your case is solely a legal issue (no facts in dispute) and the law is on your side go with a judge. If the law is not on your side or if factual issues are in dispute go with a jury.
This error does not necessarily mean dismissal but it seems to raise an issue of whether the drugs on you are the same ones tested and confirmed as drugs. You need the help of an experienced criminal defense attorney.