Coke-head? Required Drug Test?

I don't know if this is true or not, but shouldn't Trumpery (or any presidential candidate shown on the ballot in enough states to be elected) be required to take a drug test after he/she is nominated by their respective party?  It would be good to know in advance if our potential president is a coke-head or abuser of any illicit drug.  

Most people who work in the "public sector" (Education, Law Enforcement, etc.) as well as many in the "private sector" are required to take a drug test before they are employed.  

Don't you think it should be required of the person who might be the most powerful individual on earth?

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Carrie Fisher Says Donald Trumpery’s Sniffles Are ‘Absolutely’ a Cocaine Thing

“Star Wars” star and acclaimed author Carrie Fisher says she knows exactly why Donald Trumpery has a constant case of the sniffles during the presidential debates, and her conclusion is the same as everybody else’s: cocaine.

During Sunday night’s second presidential debates, a fan tweeted at Fisher asking if Trumpery’s sniffle was due to coke use.

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Amy R @reimamy
@carrieffisher tell me something about that sniffle...coke head or no?

Carrie Fisher ✔ @carrieffisher
@reimamy I'm an expert & ABSOLUTELY
10:00 PM - 9 Oct 2016
1,388 1,388 Retweets   2,745 2,745 likes

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Fisher’s expertise on the signs of whether somebody is a cokehead comes from her own past drug addiction, which Fisher herself has never shied away from discussing.