Full title: A 44-year-old man went to the hospital after pus began oozing from his chest, where doctors discovered a knife that had been embedded in his body for eight years. According to the report, he showed no signs of chest pain, breathing problems, coughing, or fever, and was otherwise in good health.

My guess? They’re not sensitive enough for small bits, but could still lead to staff complacency.
i think small bits like tattoos are just painful, but there should be one for the bigger items that always ends up in the news, like the guy who brought in a gun