Tear Gas Coverage
Wake sheriff: Use of tear gas 'absolutely necessary' during May riots in downtown Raleigh
Wake County Sheriff Gerald Baker on Monday discussed recent protests, his deputies' use of tear gas and his efforts to combat racial injustice with members of the Wake County Board of Commissioners.
Everything you need to know about tear gas
The use of different types of tear gas goes back to World War I, but modern tear gas is extremely powerful. A single milligram per cubic meter is all it takes to cause irritation to a human being.