This is the reason why I am always of the opinion that nothing should be left with chance especially when it comes to work because there are some mistakes that you're going to make as a staff and it's going to haunt the business for a very long time with the kind of damage control that they are going to be required to do in order to put things right again which is why training is very important.
There are a lot of companies that even take their staff for a refresher training most times. You know those yearly or 3 year refresher courses where they get updated on the changes that have happened in the industry. So, no matter how experienced a staff is, there is need to go for training most times too.