A 74-year-old grandmother says Derrius Guice sexually harassed her at the Superdome back in 2017 ... and she says the ex-LSU superstar was so vile, she's still "scarred" by the run-in.
Gloria Scott explained the encounter to lawmakers during her testimony in front of the Louisiana Senate Select Committee on Women and Children on Friday ... and she got emotional bringing up the memory.
Scott -- choking back tears -- said while she was performing her security job at a Dec.