The Io Police Department is the Inter-Solar System Police outpost on the moon Io, its officers identifiable by the PDI lettering across their backs. In Cowboy Bebop it turns up chasing a wanted man and briefly detaining a woman traveling with an unusual passenger in her trunk.
Stationed on Io, this department handles law enforcement for the moon as part of the wider ISSP structure. Its uniformed officers carry the PDI marking on their backs, and its brief appearance in the story pairs a routine manhunt with a strange encounter that slips out of their grasp.
As the local enforcement body on Io, the station worked a case built around the fugitive Domino Walker, dispatching officers to canvass the moon for leads while advertising a bounty on his head. The hunt turned up an odd complication when the police stopped a woman named Coffee and discovered a child riding in her vehicle's trunk. They hauled her in for questioning, but she maintained she knew nothing about how the girl had gotten there.
The department operated as one of the many planetary and lunar branches of the Inter-Solar System Police. Its officers, marked with the PDI insignia, handled the Domino Walker bounty and the short-lived detention of Coffee, who slipped out of custody the moment she spotted the child, Ed, through a window.

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The Io Police Department is the Inter-Solar System Police branch stationed on the moon Io, part of the wider ISSP law enforcement network. Its officers wear the PDI insignia across their backs.
The Io Police Department pursued the fugitive Domino Walker, dispatching officers across the moon and advertising a bounty for his capture.
The department detained a woman named Coffee after discovering a child hidden in the trunk of her vehicle, though she claimed to know nothing about how the girl got there.
Officers of the Io Police Department carry the letters PDI on the backs of their uniforms, marking them as part of the Inter-Solar System Police.
The Io Police Department first appears in the episode Mushroom Samba.
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