(a) A person commits an offense if the person escapes from custody when the person is:
(1) under arrest for, lawfully detained for, charged with, or convicted of an offense;
(2) in custody pursuant to a lawful order of a court;
(3) detained in a secure detention facility, as that term is defined by Section 51.02, Family Code; or
(4) in the custody of a juvenile probation officer for violating an order imposed by the juvenile court under Section 52.01, Family Code.
(b) Except as provided in Subsections (c), (d), and (e), an offense under this section is a Class A misdemeanor.
(c) An offense under this section is a felony of the third degree if the actor:
(1) is under arrest for, charged with, or convicted of a felony;
(2) is confined or lawfully detained in a secure correctional facility or law enforcement facility; or
(3) is committed to or lawfully detained in a secure correctional facility, as defined by Section 51.02, Family Code, other than a halfway house, operated by or under contract with the Texas Juvenile Justice Department.
(d) An offense under this section is a felony of the second degree if the actor to effect his escape causes bodily injury.
(e) An offense under this section is a felony of the first degree if to effect his escape the actor:
(1) causes serious bodily injury; or
(2) uses or threatens to use a deadly weapon.