 Jeffrey's father never taught him to dissect animals. Glass also stated that Dahmer's father Lionel teaching him how to dissect animals as a kid was highly unlikely. I'm not so sure that's accurate. Miss Glass, who became acquainted with Dahmer's parents in the 1990s, said, Lionel and his kid are shown traveling about seeking for roadkill to dissect in their garage in the series. As a deranged sort of fatherly bonding, Lionel, a research scientist, is seen showing his son how to chop up the dead animals. In actuality, Lionel never educated his son about dissecting, discarding, and saving animal parts, and only discovered this after his son was imprisoned.