The "Innovate to De-Escalate Modernization Act" seeks to update federal firearms regulations by creating an exemption for certain less-than-lethal projectile devices from existing restrictions under Title 18, United States Code. This modernization aims to account for advancements in technology and the development of less-lethal options. The bill specifically defines a "less-than-lethal projectile device" as one not designed to expel common ammunition or projectiles exceeding 500 feet per second, and intended for use without causing death or serious bodily injury. Furthermore, such devices must not accept or be modifiable to accept ammunition feeding devices loaded through a pistol grip or commonly used in semiautomatic firearms. The Attorney General is mandated to determine if a device meets this definition within 90 days of a submitted request.