Hong Kong demonstrators have suspected that communist Chinese police or military has been deployed among the Hong Kong Riot Police, now it seems that PLA soldiers at the Gun Club Hill Barracks do have Hong Kong Police uniforms and are training at the barracks.
This makes you will not be able to trust the Police in Hong Kong, as it may be a communist who has no clue about how Hong Kong law works and this also explains why there is so much pro-communist support within the Hong Kong Police.