OK, banned for general use by 99% of us, which I used in the context of this thread. For those needing absolute clarity on my loose term 'banned' referring to this subject, here is the statement on Diazinon from the EPA:
As part of an agreement between EPA and diazinon registrants to phase out and eliminate all residential uses of the insecticide diazinon, as of December 31, 2004, it will be unlawful to sell diazinon outdoor, non-agricultural products in the United States. EPA is issuing a reminder notice to hardware stores and home and garden retailers to inform them of the December 31, 2004, stop sale date for all outdoor diazinon home, lawn, and garden products.
Dursban has been available and restricted varyingly, and the EPA is still supposedly doing an analysis on the safety of the use of Dursban and coming to a decision on its use in the US. As of 2000 it was banned for residential use outdoors, and in 2002 it was banned for residential use indoors. It is complicated, but here is the EPA web site on chlorpyrifos, the active ingredient in Durzban:
(broken link removed to http://www.epa.gov/pesticides/reregistration/REDs/factsheets/chlorpyrifos_fs.htm)