Conn. Gen. Stat. § 1-350d: Execution of power of attorney.

A power of attorney must be dated and signed by the principal or in the principal's conscious physical presence by another individual directed by the principal to sign the principal's name on the power of attorney and witnessed by two witnesses. A signature on a power of attorney is presumed to be genuine if the principal acknowledges the signature before a notary public, a commissioner of the Superior Court or other individual authorized by law to take acknowledgments.