Avary was sentenced in September to a year in jail and five years probation for causing a drunken driving car crash that killed a passenger and injured Avary's wife. News reports say he has been serving his time in a work furlough programme.
But on Friday Ventura County sheriff's spokesman Captain Ross Bonfiglio said the 44-year-old Avary had been locked up in the county jail.
The Los Angeles Times and the Ventura County Star reported that he was removed from the furlough program and jailed after allegedly Twittering about his experiences since being sentenced.
But Bonfiglio told The Associated Press that he was jailed over security issues and Twittering wasn't a key factor. Avary attorney Mark Werskman denied Twittering caused his incarceration.
Avary and Quentin Tarantino share the 1995 Academy Award for writing "Pulp Fiction."
