Yellow Doves (above), suspected contents piperazine.

waffles2289 has submitted another good report to, along with test results.  Check them out:

Date Submitted: May 27, 2010, 1:57 pm GMT
Last Updated: May 27, 2010, 6:45 pm GMT
Submitted By: waffles2289
Name: yellow Dove
State/Province: Miami, FL (Kendall)
Logo: Dove
Colour: Yellow
Shape: round
Texture: Good impressed, waxy
Report Quality Rating: not rated
Description: Taste was EXTREMELY bitter, it burns tongue
Suspected Contents: Unknown
Rating: Adulterated
Warning: yes
Tested: yes
Mecke Reagent: No Reaction
Consumed: no

No reaction on the Mecke Reagent.  That spells piperazine for us.

Be Careful Miami,

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