Colorado

Recording or intercepting a telephone conversation, or any electronic communication, without the consent of at least one party to the conversation is a felony punishable by a fine of between $1,000 and $100,000 and one year to 18 months in jail. Colo. Rev. Stat. § 18-9-303. Recording a communication from a cordless telephone, however, is a misdemeanor. Colo. Rev. Stat. § 18-1.3-401. Using or disclosing information obtained through illegal wiretapping is a felony, if there is reason to know the information was obtained illegally. Colo. Rev. Stat § 18-9-304.

A person may use wiretapping or eavesdropping devices on his own premises for security or business purposes, if reasonable notice of the use of such devices is given to the public. Colo. Rev. Stat. § 18-9-305.