It’s never a good idea to bring your phone with you. It can be used, even while powered off, to track and surveil you. The BLM protests were just the tip of the iceberg. The apps you have on your phone track you. The government is buying that tracking data. Your phone is a massive privacy weak point. It’s basically a bug you carry on you willingly. It’s not safe. Period.
Leave your phone at home. It’s not worth it. It may not bite you in the ass the day of, but could very easily come back to haunt you after they investigate, in case anything goes “wrong” in their eyes. It’s just not worth it.