Antidoping officials say the test was new at the time, so the threshold for triggering a positive result for the banned substance was set conservatively high, and would later be lowered.
He attributed the change to an improved economy, with the creation of entry-level jobs triggering home buying by first time homebuyers backed by support from federal housing programs.
Plaid condemn a "bland budget", claim the Chancellor's move to spend more on infrastructure is "a political admission of failure" and - at the same time - nowhere near enough to achieve its aim of triggering growth.