When 1080 poisoned cereal pellets are dropped from the air, the poison in cereal dust is found over the entire treated area and beyond. Very little is known about the spread of this toxic dust but it was found 1 km beyond the application zone 5 days after an aerial 1080 drop (sampling for dust further away, and later after the drop, was not carried out). There has been no research into how long 1080 poison persists in treated areas. In the ERMA documents it was recognised that it might persist indefinitely at low concentrations