As SwimSwam noted, King has unorthodox turning form, as her two wrists are often at different angles when she touches. Even still, it would be difficult to imagine making this call in real time with any certainty:

FINA has been enmeshed in a series of overlapping controversies this week, as it has formally warned both Chinese swimmer Sun Yang and several of his rivals for bickering and protesting. Several swimmers, including King, have been critical of FINA for its handling of the doping accusations against Sun. “FINA has currently done more to reprimand Australian Mack Horton than they have done to reprimand Sun Yang,” she said after Horton refused to share the podium with Sun earlier this week.

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Even if FINA won’t give an explanation, King didn’t seem too broken up about the DQ.