what is it called when people have no idea that they are in their drinks because they are tasteless and odorless?

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You can find this with a GOOGLE Search. I entered "knock-out drops" and found it!

Sra

the second letter has to be an "a". The word is 13 letters long. I can't seem to find a fit.

Try this --

http://www.healthyplace.com/COMMUNITIES/sex/date_rape/date_rape_chloral_hydrate.asp

The condition you're referring to is known as being "colorless, tasteless, and odorless" (CTO). This term is commonly used to describe substances that lack any discernible color, flavor, or aroma. These substances are difficult to detect because they do not have any distinctive sensory characteristics.