K2/Spice/etc. is stranger danger zone.. the only way they're able to market it is by calling it a "plant nutrient" or some shit. While it's supposed to mimic the effects of a cannabis, it truly pales in comparison to some o' dat nice herbal sensations. It takes like woodchips, might you give a headache, and IMO more trouble than it's worth. I remember a few of my buddies who were Marines tried it simply because they liked to smoke weed but had more regularly scheduled piss-tests. Like stress weed, it gets the job done "somewhat" but you're also inhaling other contents that aren't necessarily listed on the "spice/k2" package, thereby putting you at higher risk if smoked long-term. K2 is for people who absolutely cannot find/smoke weed, salvia is for people who wanna see their friends act silly for 5-10 minutes, and herbs are generally just God's gift to man...
Go the real deal Holyfield, buy SYNTHETIC URINE (w/ handwarmer included) for the test.. For a white collar job, I doubt they'd be testing people unless you gave them a reason to.. but even if they did test they're not watching you pee like a probation officer would be.