The place I go to only uses new needles? I thought that would be the same everywhere?
The machine is covered in a bag to prevent any blood transfer from the machine each time a new person takes a seat.
Basically, everything is done in front of the customer, unpacking the needles, new bag, guy cleaning his hands, the place smells cleaner that any hospital.
Just ensure all the above happens and the risk is minimal, make sure you choose a design you can live with for life, that's the trick!
YYZ