Here are three takeaways from yesterday's testimony at the trial of former Minneapolis policeman Derek Chauvin, accused of killing George Floyd, a Black man whose death in May led to protests against racial injustice in cities worldwide: * Floyd's girlfriend Courteney Ross, 45, testified they were a loving couple who struggled with an addiction to painkillers. Chauvin's lawyers argue Floyd's death was the result of an overdose, but the Floyd family's lawyers said in a statement: "Tens of thousands of Americans struggle with self-medication and opioid abuse and are treated with dignity, respect and support, not brutality." Months ago the…