So in theory, you could book a girl for a day and then take her in the morning to this clinic to both get tested (the full works including HIV). Spend the rest of the morning/afternoon wondering around the city and passing the time before getting the results. When you're both in the clear you can take her back to your hotel and bareback her all night.
Although it seems fool proof, it still doesn't sit well with me.
Hmmmm....but if you did that with...say....three women...or four...! Four wet pussies...no condom...skin on skin...Ooooo taboo!!
Don't kid yourself - that is really no safer - many of the diseases DSE test for have an incubation period which means they may be present but not show up in tests - these vary from 2 weeks up to 6 months for HIV. Even a WG who is tested weekly could come straight from DSE, be infected with HIV by the next punter they see, and start infecting their subsequent clients. So even if you saw them the next day and took them back to DSE and they show all clear there is a chance - however slim - that they could infect you with HIV.
Of course it's all about relative risk - and the above is extremely unlikely unless there are open wounds etc - but don't kid yourself there is a foolproof way to avoid STI's especially when you bareback.
It's been said before but there's a lot to be said for repetition - the only foolproof method for avoiding STI's is to not have sex.