Why use the grammatical quantifier “all”?

Clearly, politicians enrich themselves in a variety of ways. Clearly, many of them use their positions of power to abuse that. And still clearly, there are examples of politicians that truly are working to change things for the better. Some of those persons sacrifice much and lose out on many opportunities.

There is no single answer for “all” politicians, but there is plenty of evidence to say that many do it to enrich themselves while others do it to enrich their communities as best they can.

In the end though, politics tends to change people and often not for the better…

What country are you in? What kind of job are you applying for? What are the drug laws in your area and/or nation? What industry are the jobs within? Many industries are legally bound to drug test. Does the company do this to prevent legal liability for some reason? Perhaps company reputation, dependability, and/or cost management are important factors for them . Etc etc.

In short, depending on the area, drug testing is pretty normal.

As for social media, always assume that your employer, co-workers, and anyone in your life will look up your social media and use it as a basis for understanding and assessing you. If you’re concerned about what people will think, then privatize and/or anonymize your social media use.