What would The Reinsch test would be used to detect?

The Reinsch test is used to detect the presence of heavy metals, particularly arsenic, in biological samples. In the test, a sample is introduced to hydrochloric acid and heated with copper metal; if arsenic is present, it forms a metallic arsenic deposit on the copper. This test is primarily utilized in toxicology and forensic science to identify arsenic poisoning. However, it has largely been replaced by more modern and sensitive methods of detection.