Visualizing Unquantifiable Uncertainty in Drug Checking Test Results

We propose a visualization design space for representing unquantifiable uncertainty in percent composition drug checking test results using pie and cake charts. The design space generates alternatives for use in a visual drug report to facilitate decision-making concerning drug use. Currently, this communication does not capture the uncertainty in drug checking tests, leading to poor and potentially harmful decisions. The design alternatives aim to empower people who use drugs and facilitate harm reduction efforts. Our visualizations may apply to other drug checking services and to scenarios where end users need to understand unquantifiable uncertainty.