Drugs are very detectable in the hair. As a matter of fact, any time you have ever taken drugs for the life of any one of the hairs on your head, it will show up and be visible to a drug test technician.
Saliva tests are very effective. They can detect very small amounts of drugs. How long after using will depend on the person, the amount of drugs they used and how long they used them.
The kind of drug will matter as well. Many can show up 2 months after you stop. Others a week or so.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.