It took just seconds for a routine traffic stop on a Texas highway to escalate into a fatal shooting that left 24-year-old Ashtian Barnes bleeding to death in the driver’s seat in April 2016. A civil rights lawsuit filed by Barnes’ mother, Janice Hughes, focuses on the moments leading up to the deadly shooting. Hughes claims the officer involved used excessive force in violation of the Constitution’s Fourth Amendment. What happened during those seconds and the minutes prior is now central to a Supreme Court case that could make it easier — or harder — to hold police officers accountable for the use of excessive force. Now before the Supreme Court, justices appeared likely to allow the excessive force claim to move forward. A decision is likely by the end of June. Read more at the link in bio. 📷️ starghill for NBCNews