Moon Tae-young, a ministry spokesman, says North Korea's actions on this occasion can be seen as having violated customary international law.

VOA: standard.2009.09.11

In Yemen,when you finish your soda, it is customary to toss the can onto the street.

VOA: standard.2010.04.01

"Many of the lands are under customary arrangement and depending on the specific area where the land is being acquired the specific customary arrangements in that area would apply,"

VOA: standard.2009.08.23