Amazon seasonal positions and drug testing???

So I received this email from them “Congratulations! Amazon is extending you a contingent offer of employment! Important next steps and documents to complete are in this email so please read the entire email carefully.

Now that you have received this contingent offer, it is time for the Amazon New Hire Event where you will:

Complete your pre-employment drug test Present Work Authorization Documents Learn more about Amazon and the job opportunity”

So what I wanted to know is since it tomorrow they are going to drug test right there once I go in?

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