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Re:Maybe buses should be free by snogglethorpe on Wednesday June 19, 2013 @04:14PM (#5907889)
Blue lighting?
Re:Maybe buses should be free by DanBC on Wednesday June 19, 2013 @05:22PM (#5908350)
Here's a page with images and some description

(http://architectures.danlockton.co.uk/2006/10/28/a-vein-atte...)

Re:Maybe buses should be free by mpyne on Wednesday June 19, 2013 @05:00PM (#5908194)
It might be the type of lighting that makes it much harder to find a vein to inject, making it much less useful for taking drugs.
Re:Maybe buses should be free by Roedou on Wednesday June 19, 2013 @04:47PM (#5908098)
Certain lighting (most often used in public bathrooms) makes it very hard to see your veins & shoot up.
Re:Maybe buses should be free by rs232 on Wednesday June 19, 2013 @04:46PM (#5908096)
UV fluorescents make it harder to find a vein.