A public health official is reviewing data from a large county. The report highlights a significant increase in fatal overdoses over the past decade, with the primary substances identified being prescription pain relievers and illicitly manufactured synthetic versions of those drugs. The report also includes qualitative data from community focus groups, where participants from various socioeconomic backgrounds repeatedly described the 'devastating' and 'widespread' impact of addiction on their families and neighborhoods. Based on this information, what is the most likely public health phenomenon being described, and which two pieces of evidence from the report are most critical in identifying it?