Caltrops are spiked weapons used against men and horses since at least as early as Roman times. Later versions were designed to deflate automobile tires. They are a type of anti-personnel weapon, and anti-vehicular weapon. Japanese samurai used a similar weapon, the makibishi.

Why are caltrops illegal?

According to the Smith County Sheriff's Office, the caltrops are made from rebar. They are sharpened to four metal points so that there is always a sharp edge sticking up. ... Even possessing caltrops is a felony in Texas. It's also illegal to manufacture, transport, repair, or sell them.

Are caltrops banned?

Beginning Thursday, caltrops are illegal in the Lone Star State. State Rep. Aaron Pena crafted the caltrop ban at the behest of the U.S. Border Patrol, whose tires have borne the caltrops' trademark slashes.