Not often these days. EPA, DOT, and DHS regulations, not to mention FDA bans on all hemp products, plus licensing, requirements, and heavy taxation, have made such a muck out of the rope-making industry the materials for carrying out this sentence are hard to come by..
I do have an alternate solution, however: with all the states now banning lead wheelweights for balancing tyres, lead is fairly readily available. So far. Although California's Prop 65 probably requires large labels on all lead products, they bing considered "lethal". No worries, California does not have to be the venue for carrying out the sentence.