This thread caught my eye because I have extensive experience in making mead, beer and in growing my own weed over the last two decades. I will not claim to be an absolute expert but here are my thoughts on this subject.
I have tried using stems/seeds in various ways many years ago and with extremely disappointing results. I am much more educated now and would never even consider it. Seeds will not get you high unless they are completely covered in THC from being in contact with the bud. It's better to save them for growing or just throw them away. Stems contain very little THC and it would take quite a bit of them to get much THC out of them. And here's the bottom line. Stems taste nasty and will ruin the flavor of anything you to put them into. Mead is very expensive to make. Honey is not cheap. And I believe it would be barely consumable if it had canna stems or even your premo bud steeping in it for several months while the mead ages. And besides the nasty taste I doubt there would be enough psychoactive drug in there to even be noticed.
There are a few ways to extract THC from your weed and I would still never consider using stems and seeds after the experiences I have had. Not even if I was desperate.
THC in the form of Hash is extracted with the use of canna leaves, ice water, and a series of filters.
THC in the form of Hash Oil is extracted with the use of high grade alcohol or even solvents such as paint thinner. The idea is for the alcohol/solvent to evaporate leaving the Hash Oil behind.
The most common way of extracting THC is through cooking with a fat such as oil or butter. If you are growing your own then every leaf on your plants is a gold mine and should never be discarded. If you are a smoker, save your bud for smoking and use the leaves for your cooking/hash/hash oil (check out my "coconut canna tea" recipe).
To get back to the subject...If I wanted to ad THC to one of my mead recipes I would first wait until the mead was completely fermented out. That will take about 4 to 6 months. The I would take a couple of cups of the fermented mead and put it into a sauce pan and then ad hash oil made with the use of Everclear, Absynthe or a high alcohol vodka and then boil until the hash oil is thoroughly dissolved. Take a glass of your newly fermented mead and ad some of the boiled mixture to the mead, stir and enjoy. If the flavor of the resulting is just to nasty to believe then don't ruin the rest of your batch with it. If the flavor is mild to almost un-noticeable then stick with it or adjust it until it gets you to where you want to be.
I personally would be very skeptical of anyone who says they dry hopped their brew and it turned out great. Regardless of the taste I just don't think their is enough alcohol in beer/mead/wine for very much of the THC to become psychoactive and would be a disappointing waste of good THC. I have no doubts that there are people out there who get their kicks out of convincing novices to ruin expensive batches of brew/mead/weed/whatever by telling them "I've tried it! It turned out great!"
Like I stated before, I am no expert but, these are my thoughts on the subject.
Now let's get high Stoners!