It's a pin job
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You don't need a warrant to search the belonging directly on the person of someone arrested.
There is probably a chain of custody question involved here.
You do have to marandize the suspect though, otherwise they were in custody illegally. And this everything found in his possession was found without probable cause. Luigi was not ready his rights and was placed under police custody illegally.
Miranda warnings are required before interrogation.
He matched the description of the suspect. That's probable cause for arrest.