...forgot to add, he always washes it through several times before cooking it
Apparently, rice is so full of arsenic that even watching it several times won't help. After reading that, I switched to potatoes, only stopped on the track when half of the potatoes had black rings in them and some even had holes. Quite a shock..
Soak your rice overnight – this opens up the grain and allows the arsenic to escape. Drain the rice and rinse thoroughly with fresh water. For every part riceadd 5 parts water and cook until the rice is tender – do not allow it to boil dry.8 Feb 2017
How to cook rice to remove the most arsenic | TreeHugger
https://www.treehugger.com/green-food/how-cook-rice-remove-most-arsenic.html
But beware as 5 parts of water will turn the rice to gruel!