How do you know if its the police unless you open... could be a summons

>From: brian Honan <cartruckbus@HOTMAIL.COM>

>
>I always wondered if you were parked say on a public street with your
>curtains drawn doing whatever you do when the curtains are drawn and some
>one knocks on your door perhaps the law, do you need to open it? I would
>supose this goes under the same clasification if the van is residency or
>vehicle.
>
>Brian
>
>Pittsburgh Pa
>
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