Freedom will come with conditions for Ethan Couch, who's scheduled for release from jail today.

The 20-year-old, who was 16 when he killed four people in a drunken-driving crash, must wear an ankle monitor equipped GPS device at all times during his probation. The monitor is intended to enforce a 9 p.m. curfew.

Other requirements of his early release include numerous provisions regarding drugs and alcohol.

Couch made national headlines in 2013 after he received 10 years' probation and no prison time for his crime. A psychologist testifying in Couch's defense coined the term "affluenza", claiming his wealthy upbringing made Couch unable to comprehend the consequences of his actions.

Couch was later arrested for fleeing to Mexico with his mother and received a 720-day jail sentence after being tried in the adult justice system.

Couch, who will turn 21 about a week after his release, will be monitored for alcohol use with a substance-abuse test patch. The patch will be changed every 10 days, and Couch must call a drug test hotline daily when not wearing the patch.

Also, the probation officer may randomly test Couch for drugs, in which case he'll be required to submit samples of hair, urine, blood, breath or saliva, as requested.

He also can't drive any vehicle without a camera-equipped ignition interlock, a device that prevents a car from starting if the user has been drinking.

is not allowed to take any medication that isn't prescribed. Any prescriptions must be reported to the supervising officer.