You may have a civil cause of action against the store, as well as the loss prevention employee, for their excessive use of force. However, you would want to address this issue with a personal injury attorney see if they feel it something that you could pursue.
Unfortunately, once you brought the police into the matter and gave them a statement, it is out of your hands. Not infrequently, a complaining witness, such as yourself, will attempt to drop charges after the matter has been filed. Whatever he has been charged with is now between him and the District Attorney. From this point on, you are only a witness, without any authority to discontinue the proceedings.
If you consented to the requested search, then you would have waived your rights under the 4th amendment. If you did not consent, any possible violation would depend upon how visible and obvious the glove contents were. I suggest you speak with local counsel regarding a motion to suppress.
At your first court appearance, counsel will be appointed for you. The avoidance of jail time is always dicey, but is certainly a possibility. However, be prepared to deal with the issue of restitution.
Your situation does raise possible issues. I would agree that there may be the basis of an entrapment or necessity defense here. You could also argue that you were acting under the color of authority of the officer. However, each of these defenses would be somewhat iffy and not particularly easy to present.
Your friend's situation is pretty normal. Yes, she will undoubtedly be charged with a DUI and be the subject of to a separate suspension action from the DMV.
Having said that, she should realize that just because she is charged, does not mean the matters are not defensible. However, she should make sure that she does not make the not uncommon mistake of going beyond the 10 day period to contact and request a DMV hearing.
Are you sure that he meets the DACA qualifications? Does he have a criminal record? If not, is he under 31 years of age? Did he arrive before the age of 16? Has he lived in the United States for at least five years continuously? Is he a high school graduate, college student or military veteran?
So far, only about 4,500 applications have been approved, as opposed to about 2,000 which were rejected or else were sent back as incomplete.
Depending how far along you are in your period of probation, you can petition the court for an early termination of your probation, followed an expungement of the charges from your criminal record.
Do realize, however, that this will only affect a criminal records check. DMV will still have it in their records.
There is a bit more complexity to defending a DUI than merely accepting at face value the reading of the breath test. Depending upon a number of factors, you may not have been impaired at the time that you were driving. Consult with an attorney who is knowledgeable in the specific area of defending these types of cases.