must be freely and willingly given and without coercion, duress, threats, use of violence, fear of injury, or any suggestions or promises of leniency or reward. a statement induced by the slightest hope or benefit or the remotest fear of injury is not voluntary. to be voluntary, a statement must be the product of a free will and not under compulsion or any necessity imposed by others. the burden of proof is upon the state to establish that the statement was voluntary, that is, freely and willingly made. if you do not find that the statement was voluntarily, you may not consider it for any purpose. you should consider with great care and caution the evidence of any out-of-court statement allegedly made by a defendant offered by the state. the jury may believe any such statement in whole or in part.