There is no way to tell, but I'm gonna go with 'there is a very good possibility that it won't divide evenly'.
My reason for saying this is that I doubt that someone went through the trouble of making a great imitation of the original candy, but adding LSD early on in the recipe. Instead there is most likely some liquid acid dropped onto it. If it were properly evenly distributed I would have expected the crystal citric acid to have dissolved into that acid solution giving a more even film layer upon drying. However the quality of the photo does not allow very good judgement of what those white spots on the candy are supposed to be. But I am assuming it is just the citric acid.
Based on this ^ you would need to find the spot where you can clearly see that the acid was dropped - I don't give you a good chance of finding that... so a way to solve this problem is to put all of the candy in a glass of non-tap-water for a while to dissolve the LSD. Then if you stir the glass a little and take out the candy that gave off the LSD to the water, that glass of sugary sour water should contain 300 ug which you could then divide into even portions.