Conn. Gen. Stat. § 54-152: Allowance to witnesses from another state in criminal prosecutions.

When, in any criminal prosecution, it is necessary to obtain the testimony of any witnesses residing without this state, the Chief State's Attorney may allow them a reasonable sum for their time and expenses in going to, attending upon and returning from the court and may allow a reasonable sum for the expense of procuring their attendance or procuring any document from without this state necessary to be used as evidence on the trial of such prosecution, to be from the appropriation for the Division of Criminal Justice.