Surely most environmental laws are passed with good intentions. But they don’t always have the most desired effects. A good case in point is California’s Plastic Trash Bag Law, which requires trash bag manufacturers to use 10 to 30 percent recycled plastic in their product. That all sounds well and fine, but according to the Reason Foundation, manufacturers have found that such post-consumer plastics are hard to come by, and the poor quality of the materials means the bags have to be extra thick, reinforced with plastic from virgin sources. Since other manufacturers want to use the same material for much more popular recycled products such as plastic decking and siding, maybe this trash bag law needs to be round-filed.