I'm thinking the next scientific instrument turned phone accessory is going to be raman spectroscopes. It could easily solve a lot of problems of things like adulterated food and drugs being so common. There's also research done that shows that many regular consumer phones on the market now have CCDs which are even sensitive enough as-is to read the laser reflection and sort out what the chemical is. There's an implementation here as an add on, but I want to see them embedded in the phones themselves! [1]