Just started a new job. One quick question

Just started my first job out of college in a great field. I’m working for a multinational company which has thousands of big clients. Throughout the hiring and on boarding process, there was no drug test. Today I met with hr to go over documents since I just started and once again, no mention of drug tests anywhere. Does this mean I’m in the clear to smoke some weed on the weekend or am I still subject to testing?

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