https://www.dailymail.co.uk/sport/paralympics/article-13801921/Paralympic-Games-amputee-swimmer-wrongly-disqualified.html
"Paralympic Games: Amputee swimmer wrongly disqualified over little-known rule as chaos descends on Paris pool
- Ahmed Kelly was wrongly disqualified from his Paralympic swimming heat
- The Iraq-born Australian did a butterfly stroke during his freestyle leg
- Officials had overlooked the fact that butterfly is permissible during freestyle"