How much jail time could a minor get for bringing a gun to school in Tracy, ca? He was already on probation for bringing a knife to prior school?

He can be put into detention till he is 21 if tried as a Juv.
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I do believe CA has stricter laws than other states and he already is on probation so I agree with Fr Chuck

The California Penal Code (http://www.leginfo.ca.gov/.html/pen_table_of_contents.html) may very well have any number of provisions which would make this conduct criminal. Has he been charged yet?