@barbkiewatt: A New Bill Could Allow Federal Law Enforcement To Spray Rioters With Dye-Filled Water Cannons That Stain Their Skin For Days, Making Identification Easier A claim circulating on social media says Congress is drafting legislation that would let federal law enforcement use water cannons filled with dye against rioters. The dye is described as staining skin for days so people can be identified later. No official bill text or congressional announcement confirming the measure has been widely reported so far. Similar tactics have been used in other countries. Hong Kong police sprayed blue dye from water cannons during 2019 protests to mark participants. Other places have used colored water or related methods for crowd control and later identification.