You can use the EZ test kit Marquis Reagent (most often used for testing ecstasy) to determine if their are actually opiates in the pill. Wikipedia has a list of colors that indicate which chemical is in the pill.
You can buy the kit on Bluelight, I believe.
If not, dancesafe.org has them.
^Yes, it should turn reddish/ violet with Marquis, and I believe dark blue-green with Mecke. This won't say specifically that it is hydrocodone, just that it is one of a few opiates.
Is there a way to determine the if a pill contains Hydro or Oxy? I am not concerned about measuring the amount, I would just like to ensure that it even includes what is supposed to be the "active" ingredient.