There might be some disagreement because each place does this slightly differently, but I looked up CA rules (IANAL). Based on the fact you stated they brought drugs to school, it seems like they can definitely be suspended for quite a while:

Your child has the right to go back to his/her initial classroom placement after the 10 consecutive days of suspension expire even if a manifestation determination meeting is pending. However, there is an exception if the student’s conduct or behavior involved weapons, drugs or inflicted serious bodily injury. When this occurred, the school can move his/her placement to another setting for 45 days. 1415(k)(1)(G); 34 C.F.R. § 300.530(f)(2), 300.530(g).

https://www.disabilityrightsca.org/publications/my-child-with-a-disability-keeps-getting-suspended-or-recommended-for-expulsion

Drugs in general are a big no no and can jeopardize these IEP protections. Additionally, the degree of disruption due to their disability is 100% a relevant factor when considering LREs. This should be readdressed if their behavior has changed or worsened.

I’m sorry you’re having a difficult time with this student. I know in general teachers aim to do their best for all students in their care. It seems like this post is more venting than anything else but if this is serious and likely to cause injury to others I do think there are avenues to explore for this student that may be more beneficial for everyone long term. Having a disruptive violent child can be extremely damaging to the entire class, but I do hope that all accommodations have been made for them in an effort to prevent this kind of behavior from them. I do think the tone of some of your comments are not what people want to see in educators, but I’m just attempting to address the general points you’re bringing up, seeing as all of us can be our worst on the internet sometimes.