Conn. Gen. Stat. § 9-159s

(b) Any such notice shall indicate that the resident is entitled to vote or register to vote unless the resident is determined incompetent to do so by a probate court, or unless the registrars of voters or their designees jointly conclude at a supervised voting session that the resident declines to vote the ballot or they are unable to determine how the resident desires to vote the ballot, as provided in subsection (g) of section 9-159q . The notice shall also specify that a resident who requires assistance to vote in accordance with section 9-264 by reason of blindness, disability or inability to read or write may receive assistance from a person of the resident's choosing.

(c) The administrator of any such institution, facility or residence may also provide such notice to a person with a power of attorney for a resident of the institution, facility or residence.

See Sec. 45a-703 re determinations of competency to vote.