>I presume this is to make it easier to spot explosives? Open hoop style trash cans (bag holders really) are faster and more efficient for the janitor to asses

>I presume this is to make it easier to spot explosives? Open hoop style trash cans (bag holders really) are faster and more efficient for the janitor to assess the fullness of a bag from across the station (and for the supervisor to assess the quality of the janitor's assessment) and if needed to grab the full bag out of the hoop and toss on a new one. The hoop cans themselves are cheaper too. Any benefit to the police is likely secondary to the day to day cost savings from making it easier (and therefore faster and therefore cheaper) for the janitors to do their jobs.