Is your son IEP qualified?
This question is of the utmost importance. I cannot stress this enough to you. IF he is in special education, and his behavior is uncontrollable, bad things can happen (such as being restaffed to an alternative school that is punitive.) However, good things could happen, also: difficult child might get into a therapetic school or your SD might have to pay for Residential Treatment Center (RTC).
There is MAJOR legal protection in having your child qualified for Special Education rather than accepting a 504 plan as "the same." It's not. IF you child is Special Education qualifed, the he can not be suspended for more than 10 cumulative days in any one school year and can NEVER be expelled. A SD can NEVER end it's obligation to a Special Education child to provide a FAPE until the child is 21--with one exception: children over 17 incarcerated in adult facilities have very limited rights to education. However, if you advocate for your child now, you will reduce the chances of having son in that situation at 17.
Your child is the type that needs strong advocacy to get a good school outcome. Unless your SD is unusually tolerant, they will want to "push him out." You need to know what your rights are to protect him for push out as well as illegal suspension and expulsion.
I suggest www.wrightslaw.com
as a good place to start becoming an educated advocate for your child.