In this subchapter:
(1) "Alert system" means the statewide blue alert system that is developed and implemented under this subchapter.
(2) "Law enforcement agency" means a law enforcement agency with jurisdiction over the investigation of an alleged offense that resulted in the death or serious bodily injury of a law enforcement officer.
(3) "Law enforcement officer" means a person who is a peace officer under Article 2A.001, Code of Criminal Procedure, or a person who is a federal law enforcement officer, as defined by 5 U.S.C. Section 8331(20).
(4) "Serious bodily injury" has the meaning assigned by Section 1.07, Penal Code.