function teamPrevention( ply, inf, att, amt, dmg )
if att:GetClass() == "prop_physics" then
dmg:ScaleDamage(0)
end
    if ply:IsPlayer() then
        if ply:Team() == TEAM_MAYOR then
            if inf:Team() == TEAM_SWAT or inf:Team() == TEAM_POLICE or inf:Team() == TEAM_CHIEF then
                dmg:ScaleDamage( 0 )
            end
        end
    end
end
hook.Add("EntityTakeDamage", "teamprevention", teamPrevention )

function PhysPickup(ply,ent)
if ply:IsAdmin() then
return true
end
end
hook.Add("PhysgunPickup", "physpick", PhysPickup)