Sentner was arrested after a Cheyenne-area trooper pulled him over for speeding on Interstate 80 and discovered 35 pounds of marijuana in his rental car.
Councilmember Chris Walsh said the ordinance would help reverse the attitude that underage drinking is a "rite of passage" in the community and not a health and crime issue.
The inmate reportedly told investigators that he and Sheesley had sex at least three times in Sheesley's vehicle while parked behind the baseball fields in north Casper.
The Supreme Court said a municipal court cannot place a defendant only on probation for an offense that has not been made punishable by a jail or prison sentence.
In 2013, Layton told sympathetic Casper residents that her son, nicknamed "Ninja Dorian," had terminal brain cancer and she needed money for his treatment.