We never eat things straight off the bush. I soak brambles in salt water for hours and then rinse them several times as there are usually living things in there somewhere. There are usually small spiders and the like and of course worms/maggots or whatever they are. The numbers can vary and one year when the brambles were early we got a lot of worms, it's more usual just to find a few.
Excellent stuff, one of your five a day plus added protein.