A couple of years back there was a nit outbreak at my grandbairns' school and though our children didn't get them that time, I was a bit itchy after babysitting and went to the chemist to get nit shampoo as a precaution. They wouldn't sell any of the preparations to me unless I had actually found a beastie! I asked my hairdresser to have a look and she found nothing, but, having four children herself, understood the need for precaution. She told me to nip into the biggest supermarket in a nearby town where I would be able to buy exactly the same treatment...no questions asked...no tiny proof required. I've always wondered why I couldn't be trusted locally, but I have heard of others having the same problems at small pharmacies.