That sounds really stressful. I actually went through something similar a couple of years ago when the police entered my place without knocking or showing a warrant. I didn’t know what to do at the time, so I just let them do their thing, but later I found out that if a search is done without proper procedure, a lawyer can help challenge the evidence. It really depends on whether your friend's rights were violated during the search. I'd recommend checking this out: https://www.99legal.com/practice/immigration/ — it’s technically about immigration, but the same firm handles criminal defense too, and their info is pretty solid. The key is acting quickly and getting advice from someone who knows how to navigate these situations.