Can taking sudafed make you test positive for methamphetamines?

27y/o husband had a few strokes in March, he tested positive for methamphetamines, can that be due to him taking sudafed for a few weeks before the strokes?

He was diagnosed with APS, and that's probably why he had the strokes.

He swears up and down it was positive because of the sudafed.

: http://alcoholdrugstreatment.info/can-taking-sudafed-make-you-test-positive-for-methamphetamines-2