Not so fast, if the drinker has no clue as to what he or she is drinking, it isn't his or her own decision... You can say that about the ink, Harry chose not to sign any paperwork Peabody presented him.. However that wasn't because he chose not to be influenced by the ink, ergo Peabody couldn't get into his mind.. Susan didn't chose to drink the love potion either, it was a mistake, if events hadn't gone down as they did, or if Harry had been a jerk, he could have taken full advantage of her, even made her his love slave if he continued to slip it to her...
The ink was never described as a potion, more like a material component of a spell. The ink on itself did nothing, it just made Peabodies work easier. It is more like Harry’s blasting rod. The ink would have no effect if Peabody was not around doing his magic.
A test of the inks he used to attain the signatures of the Senior Council for various authorizations revealed the presence of a number of chemical and alchemical substances that are known to have been used to assist psychic manipulation of their subjects.
The potion is different. We were discussing selling it as a drug which you can do only if you tell what it does, if you advertise it. It works without Harry even there.
It works more like the hexenwulf belts though I don’t think you get possessed by a spirit of lust. It brings a layer of isolation between you and the target of the magic, takes away the choice from you to that target.
It was not said with so many words but I did not get the impression that those belts were illegal. It was not the white council who stopped it.
"Hexenwolf," Bob said, with a strong Germanic accent. "Spell wolf. The Church declared war on anyone who chose to become a Hexenwolf, and burned a huge number of people at the stake."
Those things matter with the laws, not morals. If you talk about the laws of magic and you bring morality into it you just confuse matters. The laws of magic don’t stop you being a jerk or abuse people, they just bring limitations how to do it.
You can always summon a Fairy and bargain to let it do the law breaking, completely legal.