Lindsay Lohan has failed a court-ordered drug and alcohol screening test and could face a probation violation that might land her back in jail.
A person familiar with the case, who declined to be identified because of the sensitivity of the matter, confirmed the positive test results on Friday.
The person declined to specify what substance triggered the positive result, which the source said occurred within the last month.
Los Angeles Superior Court Judge Elden S. Fox had threatened Lohan with 30 days in jail for each probation violation.
Lohan later acknowledged the results on her Twitter page.
"Regrettably, I did in fact fail my most recent drug test and if I am asked, I am prepared to appear before judge Fox next week as a result," she wrote in one of a series of posts late on Friday.
"Substance abuse is a disease, which unfortunately doesn't go away over night. I am working hard to overcome it," she wrote in another post.
A hearing would be conducted before Lohan could be returned to jail.
Los Angeles County District Attorney spokeswoman Sandi Gibbons said no such hearing had been scheduled as of Friday afternoon.
The failed drug test was first reported by TMZ.com.
Lohan, 24, was sentenced to three months in jail followed by three months in rehab after violating probation stemming from a pair of drug and driving under the influence cases filed after two arrests in 2007.
She ended up serving two weeks in jail and another 23 days in an inpatient rehab treatment at Ronald Reagan UCLA Medical Center.
At a hearing last month, Fox ordered the actress to attend psychotherapy, drug and alcohol counselling as well as random drug and alcohol testing several times a week. Compliance would allow her to return to unsupervised probation in November.
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