Not really. Just the act of attempting to communicate with a witness can be seen as an effort to influence that witness. That is a federal felony.
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“Section 1512 of Title 18 constitutes a broad prohibition against tampering with a witness, victim or informant. It proscribes conduct intended to illegitimately affect the presentation of evidence in Federal proceedings or the communication of information to Federal law enforcement officers. It applies to proceedings before Congress, executive departments, and administrative agencies, and to civil and criminal judicial proceedings, including grand jury proceedings.
See 18 U.S.C. § 1515(a)(1). In addition, the section provides extraterritorial Federal jurisdiction over the offenses created therein.
See 18 U.S.C. § 1512(g); 128 Cong. Rec. H8469 (daily ed. Oct. 1, 1980); H. R. Rep. No. 1369, 96th Cong., 2d Sess. 20-22 (1980).”