This is a real lesson in LFTs not working well as "tests to enable". Lessons from two outbreaks in sporting teams. Clear evidence that the undetectable infectious period can be longer than hoped, and -ve tests increase risk by disinhibition.
https://twitter.com/GageKMoreno/status/1368602949153329157
It starts with one Athelete testing LFT-negative on Day zero and then LFT-positive on Day 1. 
By the end of the outbreak 32 athletes and staff were infected. 18 of them had false negative antigen test results.
The authors stated that the LFT false negative results led to another 13 people getting infected
The second outbreak happened through a two day competition. The index case was positive on LFT two days afterwards. 12 athletes (5 from one team and 7 the other) were infected in total.
The authors comment on the risks of negative results resulting in "disinhibition behaviour" - they documented multiple instances where rules were broken - which will have increased viral spread.
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