A military official in Washington said Jared Loughner was rejected from the Army in 2008 because he failed a drug test. The official spoke Monday on condition of anonymity because privacy laws prevent the military from disclosing such information about an individual's application.
The official did not know what type of drug was detected in the screening.
Public defenders are asking that the attorney who defended Oklahoma City bombing conspirator Timothy McVeigh and "Unabomber" Ted Kaczynski defend Loughner, who makes his first court appearance Monday at 2 p.m. MST (4 p.m. EST).
Sheriff Clarence Dupnik told ABC's "Good Morning America" the suspect had said "not a word" to investigators since his arrest. Dupnik said authorities were all but certain Loughner acted alone, saying "he's a typical troubled individual who's a loner."