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I assess your attitude toward marijuana, present you with a persuasive communication favoring liberalization of marijuana laws, and then reassess your attitude toward the drug. however, between assessment 1 and assessment 2, the president also advocates liberalization of marijuana laws. if i don't use a control group, any differences i observe are suspect on the grounds of

Answer :

Any differences i observe are suspect on the grounds of "History".

Marijuana, otherwise called Cannabis which is among its other names, is a psychoactive medication from the Cannabis plant expected for restorative or recreational utilize. Marijuana is frequently utilized for its psychological and physical impacts, for example, a "high" or "stoned" feeling etc.