http://yosemite.epa.gov/opa/admpress.nsf/eeffe922a687433c8525735900...Looks like there's going to be increased scrutiny of spot-on insecticides.
As always, Caveat Emptor, as Vendors will always sell us anything, anything they can get away with.
Before using any product, do a web search -- the web has no editors, so all info is suspect, but it may be one way to get info the vendors don't want the buyers to get.