I read something along these lines in the past couple of years too. Seeing this comment here I've taken the liberty of finding something 'official' in this regard.

https://pubmed.ncbi.nlm.nih.gov/16876928/

tl;dr - rinse your rice with clean water and then cook it at a ratio of 1:6 rice:water followed by draining the excess water will more than halve the amount of arsenic in the finished product

edit - tl;dr updated for accuracy