For USMJ, no shorting at all, per FINRA
For related company PURA, Almost no shorting - from FINRA, only 3,091 shares short
At $0.037, total amount shorted is only around $114. One trade would cover more than 10X that amount.
From FINRA:
Settlement Date 06/15/2018
Issue Name Puration Inc. Common Stock
Symbol PURA
Market Other OTC
Current Short 3,091
Previous Short 100
Chg 2,991
Avg Daily Vol 6,020,973
Days to Cover 1