Bed Sheets Used To Obscure Perp From Camera - What To Do?

We recently had a case of a perp using a bed sheet to obscure identity.

Plain white sheet over head, held out to allow them to see walking around.

Walked into a space, stole an item by gathering it under sheet, walked out.

The technique has now spread within that institution, a sort of informal half way house trying to engender trust & capability in dysfunctional dropout men.

So the camera is of little use in identification, only telling us date, time, method, perhaps approximate build and gait, shoe type.

Can anyone suggest counter measures for this type of activity?

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