FILE - onrad Hilton, left, Kathy Hilton, center, and Rick Hilton arrive at the launch party of new MTV series "Paris Hilton's My New BFF" in Los Angeles.
FILE - onrad Hilton, left, Kathy Hilton, center, and Rick Hilton arrive at the launch party of new MTV series "Paris Hilton's My New BFF" in Los Angeles.

LOS ANGELES - Hotel heir Conrad Hilton has been ordered into substance abuse treatment after failing drug tests and violating his probation.
 
City News Service says a Los Angeles judge on Tuesday ordered Hilton into a residential treatment program for at least 90 days. The judge rejected a request by authorities to put Hilton behind bars for 60 days.
 
The 21-year-old was sentenced to probation and community service last year after pleading guilty to disrupting a British Airways flight.
 
Authorities say he violated probation by trespassing, failing drug tests, failing to complete three treatment programs and traveling out of California without permission from his probation officer.