The United States Congress is due to hold hearings on the militarisation of America's police forces. The issue has gained traction in America, ever since the shooting of Michael Brown in Ferguson, in the US state of Missouri, which ignited weeks of riots. Al Jazeera's Melissa Chan reports from Caifornia. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/