Originally Posted by
Trakhak
All bike helmet models from reputable manufacturers are subjected to extensive testing by independent agencies. The agencies bestow certification on the helmet models that meet their standards. Look inside your helmet: you'll see at least one certification sticker.
Testing exists, yes, how extensive is a matter of opinion.
Experts on the subject can correct me if necessary, but I believe that the manufacturers only need to "certify" that their helmets meet the agencies' standards before being permitted to apply the sticker to the first production. I do not know whether they are required to submit any production samples to an independent testing agency first or later or ever during production.