Caltrops scattered on Van Zandt County road Posted in: News The Smith County Sheriff’s Office is searching for suspects who have been leaving caltrops, which are designed to flatten tires, on Interstate 20 in Van Zandt County. On Wednesday, June 8, the SCSO asked for help identifying the suspects who had left the devices I-20 between US Highway 69 in Smith ...PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!