So recognizable and yet not found: why does the man who squirted urine at Sven Pichal remain unknown?

The man who squirted a bottle of urine in the face of ex-radio presenter Sven Pichal three weeks ago has still not been identified. However, there are clear images of him and he has a more than striking appearance. We asked three investigators how difficult it is to find a suspect if you only have a face: “It is often a matter of luck. But there are ways to achieve that happiness.”

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