Conn. Gen. Stat. § 12-308: Fraudulent stamps.

Any person who fraudulently makes or utters or forges or counterfeits any stamp prescribed by the Commissioner of Revenue Services under the provisions of this chapter, or who causes or procures the same to be done, or who wilfully utters, publishes, passes or renders as true any false, altered, forged or counterfeited stamp, or who knowingly possesses any such false, altered, forged or counterfeited stamp, or who uses more than once any stamp provided for and required by this chapter, for the purpose of evading the tax hereby imposed, or who tampers with or causes to be tampered with any metering machine authorized to be used under the provisions of this chapter, shall be fined not more than five thousand dollars or imprisoned not more than ten years nor less than one year or both.