If by roughage you mean bushes, trees or grass, no.
yes
No.
no
Yes
raisins
a
Yes.
Caffeine will not cause a false positive in drug tests.
No. There's no THC in testosterone.
yes
Valerian Root can test positive as benzodiazepines. Ephedra can test positive as an amphetamine.
Using someone else's urine, who has used pot, for the drug test would give a false positive.