Bifenthrin moves!

"The movement of the termiticide (and emulsifier) was probably facilitated by water solubility (Smith & Rust 1990; 1991) and vapor pressure (Su et al. 1982; Smith & Rust 1990; 1991)."  (Boon-Hoi Yeoh & Chow-Yang Lee, Sociobiology Vol. 50, No. 2, 2007) 

It does not stay locked in position with soil particles AND it is very persistent.  As well, note:

"The significant enrichment, along with the prolonged persistence, suggests that movement of pyrethroids to the surface water may be caused predominantly by the chemically rich fine particles.  It is therefore important to understand the fate of sediment-borne pyrethroids and devise mitigation strategies to reduce offsite movement of fine sediment." (J. Gan, S. J. Lee, W. P. Liu, D. L. Haver and J. N. Kabashima, Published in J Environ Qual 34:836-841 (2005)).

Also, Bifenthrin produces CANCER TUMORS!

"The tumor-promoting activities of 5 commercial compounds used in termiticides were measured by a cell-transformation assay employing Bhas 42 cells. Their initiating activities were also measured by the microsuspension assay employing S. typhimurium TA98 and TA100 strains. The results of the transformation assay confirmed the tumor-promoting activities of fenitrothion, silafluofen and bifenthrin." (Goto S, Asada S, Fushiwaki Y, Mori Y, Tanaka N, Umeda M, Nakajima D, Takeda K., Journal of UOEH, 2004 Dec 1;26(4):423-30).

For more details, see:  http://poisonedpeople.com/bifenthrin.htm.