I have recently bought a Bosch GTS 10J table saw and have searched around for a dado blade. Impossible to find in the UK - they have them in the USA but not here.
It's not a case of does the saw take a dado - it's a case of can you buy a dado? I'm sure it's a safety thing and I think that using one is not prohibited but that selling them is.
When I need to cut a dado slot I make multiple free hand cuts between stop blocks.
I've given up looking for a dado blade - and if you manage to get a dado blade (£££) you'll have to make your own insert plate with a wide slot.