Note: On the Australian market so called 'boiled linseed oil' in times past was in fact boiled in its production process to produce a faster hardening rubbing oil.  Nowadays Boiled Linseed is typically raw with chemical dryers added and is not food safe rated. Dryers used in the wood coatings market have a chequered history as they are predominantly heavy metals such as lead which is toxic hence the switch to un-leaded petrols.

See here a Wikipedia source for the suggested link to crime and leaded fuel.