Del. Code tit. 16, § 6902

No person shall fire or discharge in or on or into any street, highway, alley or public place in the State any rifle, gun, pistol, revolver, cane, cannon or other appliance, whether projecting or exploding any bullet, cartridge, blank cartridge, cap (except a cap excluded from the provisions hereof under the definition set forth in § 6901 of this title) or otherwise or any explosive substance or mixture of chlorates or nitrates. This section shall not apply to peace officers in the regular discharge of their duties as such. Nothing in this section shall be construed to prohibit any person from using explosives in quarrying or for blasting or other industrial use.