Halliburton then conducted another test using a modified procedure, the letter said, and the result for the first time indicated the slurry design would be stable.
If it proves successful, the modified two-challenge rule will also be introduced for Australia's Test tour to South Africa, which is the last tour included in the referral trial.
Approval of these plants requires copious data on the parental plant, the genetic construction, the behavior of the test plant and so on data requirements that could not be met for any plant modified with older, cruder techniques (which are exempt).