8th Cir. Model Jury Instr. (Criminal) 4.05B

You [have heard] [are about to hear] evidence that [name of witness] hopes to receive a reduced sentence on criminal charges pending against [him] [her] in return for [his] [her] cooperation with the [government] [prosecution] in this case. [Name of witness] entered into an agreement with [name of agency] which provides (specify general agreement, for example, that in return for his assistance, the [government] [prosecution] will dismiss certain charges, recommend a less severe sentence [which could be less than the mandatory minimum sentence for the crime[s] with which he/she is charged]). [[Name of witness] is subject to a mandatory minimum sentence, that is, a sentence that the law provides must be of a certain minimum length. If the prosecutor handling this witness' case believes [he] [she] provided substantial assistance, that prosecutor can file in the court in which the charges are pending against this witness a motion to reduce [his] [her] sentence below the statutory minimum. The judge has no power to reduce a sentence for substantial assistance unless the [government] [prosecution], acting through the United States Attorney, files a such a motion. If such a motion for reduction of sentence for substantial assistance is filed by the [government] [prosecution], then it is up to the judge to decide whether to reduce the sentence at all, and if so, how much to reduce it.]

You may give the testimony of this witness such weight as you think it deserves. Whether or not testimony of a witness may have been influenced by [his] [her] hope of receiving a reduced sentence is for you to decide.