shadowing??? is it possible?

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In short, the answer to your question is yes!
I am not sure about CVS or any retail. But I shadowed a clinical pharmacist at a local hospital while she did rounds on the pediatric floor. Start volunteering at a hospital and just network with the people you meet and ask questions about pharmacy. I asked a pharmacist some questions and she offered me to shadow her or a colleague. GL!
 
I was able to get multiple shadowing experiences at hospitals. It really depends on their policy and management. Keep trying and hopefully you will get one!