The issue arose in 2009 shortly after Congress passed the Consumer Product Safety Improvement Act (CPSIA) of 2008. The law followed reports that inexpensive imported children's toys were testing high for lead content, which presents serious exposure risks for children.
However, the CPSIA was written with such sweeping language that it banned the making, importing, distributing or selling of any product intended for children 12 and under that contained more than a trace amount of lead. This ensnared kids' dirtbikes and ATVs because trace levels of lead can be found in parts such as brake calipers and battery terminals. It did not matter that those parts were extremely unlikely to end up in kids' mouths.