She tested positive for heroin, not THC. If she was actually actually heroin, child protective services involvement would absolutely be warranted.
The issue here is the erroneous test and complete failure on the part of the hospital to confirm its results
The painting is Friend or Foe by Robert Griffing. While he’s not native american, I can’t find anything to suggest his paintings were not made with a consideration for real history and an appreciation of the culture he’s depicting. His paintings are featured in many native american-run museums.