That "might" work, but I don't think it will.
I had court papers in my hand, and my ex wife called the police. The police were totally on her side, and didn't seem to care if I was carrying tablets from God himself. They threatened to arrest me for trepassing (I still actually owned the property, small little detail really).
I solved my problem by calling my lawyer, and taking my ex wife to court. And when she refused again, I took her to court again. I kept doing that til the judge eventually threatened to throw her into jail. That, along with a visitation mediator helped my problem.
You can try calling the police, but I tend to think they either won't get involved or they will be against you.
In my case, the cop looked at my license, and asked me how do I know you won't take these girls off to SC? Actually, even if I had, so long as I had them back by the end of the weekend, I was completely within what was ordered by the court.