I believe the amount of organophosphates has been studied on 'normal' flights, but considering these events are estimated to be 1/5000-1/50000 flights, you need

I believe the amount of organophosphates has been studied on 'normal' flights, but considering these events are estimated to be 1/5000-1/50000 flights, you need a lot more than one person to capture a statistically significant sample. But considering the number of flights per day, that's a few events per day and is probably worth investigating. There have been some post-facto blood tests trying to find if crew who noticed these fumes had detectable byproducts in their blood, which mostly found nothing, but this doesn't say much about whether the environment in the aircraft is safe when these events occur, especially since significant and acute harm seems relatively rare among these incidents.