[breakem]

.........modify such expulsion requirement for a student on a case-by-case basis."

Not exactly zero tolerance. Maybe 10% tolerance or whatever.

[Ken H]

Looks like it is zero-tolerance with regard to the criminal justice system. From the URL in the article--

Sec. 8922 Policy regarding criminal justice system referral

(a) In general

No funds shall be made available under this chapter to any local educational agency unless such agency has a policy requiring referral to the criminal justice or juvenile delinquency system of any student who brings a firearm or weapon to a school served by such agency."