Is white rice bleached before being processed?
No. It is not general practice to add bleach to rice. The brown rice bran is removed through mechanical processes. As to whether he should continue to indulge this worry...I'd be more concerned about [insert common American male problem here] before ammonia in rice. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138007/ This review has many free references in it.  Should you want further peer-review reading, I can provide it.