Drugs don't last very long in your saliva. Usually if you can stay away from the drug you don't want to show up about 3-4 days before your test, then you should be OK.
I've read that eating a meal high in fat content will facilitate passing the oral swab test
How about if we just inform you that none of them work, and not bother to list all the possibilities.
None!
Yes, you will most likely be drug tested after a civil service test. You will be drug tested randomly after passing the test.
A oral swab test
nope. employment is contigent upon you passing the drug test.
Zero
Oral
"Don't use drugs" is the best advice for passing any drug test.
Avoiding drugs.
yes
Never