This is one of the more insidious techniques used by pharma companies. See [0], search for &quot;free sample&quot;.<p>[0] - <a href="http:&#x2F;&#x2F;slatestarcodex.com&#x2F;2015&#x2F;02&#x2F;17&#x2F;pharma-virumque&#x2F;" rel="nofollow">http:&#x2F;&#x2F;slatestarcodex.com&#x2F;2015&#x2F;02&#x2F;17&#x2F;pharma-virumque&#x2F;</a>