A letter (25 October) stated that women have had to be on their guard since the 1970s and alive to the potential spiking of drinks. In fact, it goes back to before that. I remember my mother, who died in 1983, telling us that back in the 1950s, when she was at university studying to become a physiotherapist, she spotted someone interfering with her drink in a bar. She asked a friend of hers, an amateur rugby player who was used to drinking 10 to 12 pints a night, to try it. He took one sip and was knocked out cold.
Brinley Salzmann
Tongham, Surrey
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