Remember when Hong Kong sprayed rioters with an indelible blue dye and arrested them later?
Spraying rioters with blue dye has been used for riots in Egypt, South Africa, Argentina and Malaysia
Who would decide riot verses protest??
https://www.reuters.com/article/world/fact-check-hong-kong-not-japan-sprayed-looters-and-rioters-with-blue-dye-idUSKBN23X26Y/
