Mk

I found a capsule at my work, we've been having a drug problem so I was thinking about telling my boss but I don't know what kind of pill it is. It's brown on one half and orange on the other with the imprint "MK" with a circle around the letters. The markings are on both halves of the capsule on the same side. I opened it a little and white powder started coming out. Any help would be appreciated.

Hey, I found these pills! They are small and white and round. They have MK imprinted on one side and nothing on the other. I think that it may be Xanax but I haven't been able to find anything confirming or denying my suspicion. Please help I've searched everywhere and no one seems to have any info on a SMALL WHITE ROUND PILL IMPRINTED WITH MK and NOTHING ELSE.

PINK AND SQUARE HAS MK17 OR MJ17 IMPRINTED ON IT