victoria azarenko >> fishkill correctional facility - 70 miles north of new york city. to address the needs of its growing elderly prison population, new york built the nation's first unit for the cognitively impaired. all these inmates have dementia. their average age is 63 and many have alzheimers. we've joined the founder and director of the unit, dr. edward sottile, as he does his rounds. fault lines is the first television crew to be allowed here. [knock, knock, knock] >> mr. turner...how are you? how are you feeling today? today dr. sottile checks on 59 year old chris turner. serving a sentence for kidnapping and sodomy, he's also being punished for punching a nurse in the stomach. how are you doing with your arm motions? >> they seem to be a lot better now that you mention it... >> he came to us a couple of years ago with huntington's chorea. that is a genetic disease that is gradually progressive and the patient has these movements that are purposeless-he can't control his movement. and eventually, what happens is it affects his ability to swallow. and eventuall