well...i don't know if this evidence is strong enough from the point of law.. but it's better than nothing.. because he can say that you gave him this money as a gift.. than what?
rimlaw, don't think that police will react so easy.. they need to make sure that their action is legal. he didn't STILL this money, she gave it to him...THat's why she needs a contract where it's cleary stated that money is LENDED to him, with the time frames and conditions.

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“You become responsible forever for what you have tamed”. Antoine de Saint-Exupéry