Doctor's Handwriting

Today's Radio 4 Today programme has a story where "Nearly one in 10 hospital prescriptions contain a mistake, ranging from the minor to the potentially lethal." (http://news.bbc.co.uk/1/hi/health/8391667.stm)

Reasons given include the inevitable issues of handwriting, but also prescribing drugs without regard to the patient's allergies, and getting the dosage wrong.

Why, I have to ask, are prescriptions being hand-written at all? Why not crossed referenced with a list of allergies to at least alert the doctor to possible conflicts? Checked to ensure no obvious mistakes in dosage?

Why not generated from a computer system to do all the above, and more?

Is there an opportunity for Ffenics here, for a PrescriptionEase, for a simple-to-generate and low-cost app?