Science and EnvironmentLawsuit accuses Homeland Security of violating environmental law with Portland tear gas deploymentBy Monica Samayoa (OPB)Oct. 21, 2020 1:38 p.m.📨 Daily news in your inboxSign up today for OPB’s “First Look” – your daily guide to the most important news and culture stories from around the Northwest.EmailPlease leave this field blankSign up