criminal investigator
(2) the term “criminal investigator” means a law enforcement officer as defined under section 5541(3) (other than an officer occupying a position under title II of Public Law 99–399 , subject to subsection (k)) who is required to— (A) possess a knowledge of investigative techniques, laws of evidence, rules of criminal procedure, and precedent court decisions concerning admissibility of evidence, constitutional rights, search and seizure, and related issues; (B) recognize, develop, and present evidence that reconstructs events, sequences and time elements for presentation in various legal hearings and court proceedings; (C) demonstrate skills in applying surveillance techniques, undercover work, and advising and assisting the United States Attorney in and out of court; (D) demonstrate the ability to apply the full range of knowledge, skills, and abilities necessary for cases which are complex and unfold over a long period of time (as distinguished from certain other occupations that require the use of some investigative techniques in short-term situations that may end in arrest or detention); (E) possess knowledge of criminal laws and Federal rules of procedure which apply to cases involving crimes against the United States, including— (i) knowledge of the elements of a crime; (ii) evidence required to prove the crime; (iii) decisions involving arrest authority; (iv) methods of criminal operations; and (v) availability of detection devices; and (F) possess the ability to follow leads that indicate a crime will be committed rather than initiate an investigation after a crime is committed;