Can Anybody be Hypnotized?

It is said that about 95% of the population can experience hypnosis. The exceptions are: those who are educationally subnormal or suffering from senility, very young children (<5 years old), hard drug addicts, anybody under the influence of large amounts of alcohol and some say anybody suffering from epilepsy should never be hypnotised, but I have never heard of an epileptic fit being triggered by hypnosis. Where psychotic individuals are concerned, care needs to be exercised and regression/analytical therapy should most definitely not be employed.