Owing to the fact that Z1-6 travelcard holders will be able to use the
Heathrow Express tomorrow, at no extra cost, I have decided to take a trip
on this service.
I read in the media earlier in the week, that trials of a scanner system,
similar to the system used in scairports started this week, with people
randomly selected to be scanned.
If I happen to be the "unlucky" one, can I request that I am not scanned,
or can they deny me the right to travel?

Thanks
Yesterday (12th) people passing along the platform were invited to take part
in trials, there was no problem refusing, and the invites were few and far
between- although a 'sniffer ' spaniel sat strategically placed between gaps
in BTP, well within sniffing distance.