Sometimes signs aren't enough to keep trespassers away. For Julie and Del Spronk, it took dozens of calls to police and then the court system to get involved.

"What an eye opener," Julie Spronk lamented to WCCO. "Tenants' rights are not the same as squatters' rights."

The Spronks bought a property in Faribault, Minnesota for their adult son earlier this year. A few months after he moved in, the Spronks said the son left for an extended leave and locked the door behind him.

One night this summer, the Spronks drove by and found something they didn't expect.

"It was shadows and images really looming around in the darkness of the night," Julie Spronk recalled. "There were a handful of men walking around. A lot of them didn't have shirts, a couple of them had bicycles. The rest were on foot

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