Fines for texting and driving in Colorado have jumped to $300, but according to the fine print, the increased fine only applies to drivers who are texting in "a careless or imprudent manner." Therefore, drivers who are texting in any other manner are still within the law. FOX31 Denver reports: Before the new legislation, any texting while driving was illegal. Tim Lane of the Colorado District Attorney's Office confirmed the softening crackdown on all texting and driving. "The simple fact is that if you are texting while driving but not being careless, it's no longer illegal," he said. What constitutes "careless" driving is up to the discretion of each individual law enforcement officer. Cellphone use of any kind is still banned for drivers younger than 18. Teens caught with a phone in hand while driving will be slapped with a $50 fine.