How do you know if your data are crap? You go and look at the toilets. In 2018 Rajasthan, a state in north-western India beloved by tourists, declared that it was “open defecation free”. Separately, government auditors visited dozens of villages in the state to inspect homes built under a government housing-subsidy scheme. “Interestingly”, the report notes, 49% of houses had no toilets. Despite the disclosure, data dashboards continued to show potty penetration at 100%. Interesting indeed.