You are walking down the street
and cut through a parking lot.
There is a backpack there
which you glance at, but don't pay much attention to.
A few minutes later, a police officer stops you.
He asks, "Why did you leave that backpack?"
"It isn't my backpack."
"Yes it is."
"No, it's not mine."
"Well, then, you won't mind if I go through it?"
"No. It's not mine."
The police officer finds nothing of interest in the backpack.
He cites you for resisting an officer,
and gives you an exclusion from the city for thirty days.
(Strange but true story-- happened to a friend of mine.)