Since I love the "Thirty Tribunal Cases" thread, and cj.23 has mentioned he's not sure he'll manage to keep up -- in fact, he's not posted a new case since Monday -- I hope no-one will mind if I take upon myself to post Case 7. I'm striving to keep the same format of cj.23's great posts.
EDIT: For the purpose of this case I am assuming that magical Rings can be incribed on surfaces that can be folded (e.g. pages of a book) and that they are not disrupted by being folded, or even slightly soiled (as long as they remain unbroken and clearly visible). I believe this is actually according to Ars Magica canon (in particular, MoH), but if you don't, just assume that the magus in question can produce such effects -- possibly through some Minor Breakthrough.
Case 7: The Case of the healing blankets
Magus Prospero of Tytalus stands accused of selling to Joan, countess of Flanders and Hainaut, a thousand magical blankets with the power to accelerate healing. In particular, he stands accused of interfering with the affairs of mundanes, given the recent history of involvement of Hainut in mundane wars, and the likelihood of the blankets to be used in said wars. He also stands accused of violating the ruling forbidding magi to be court wizards, and of violating the Tribunal rulings of 1061 forbidding the sale of magical items directly to mundanes, requiring that any item sold to mundanes should eventually lose its power and limiting the number sold to one per year.
Prospero eloquently argues that all charges are false and unjustified, and brought against him by enemies who would sow discord within the Order, thus endangering it. In particular, he claims that it was not a sale, but a gift, for he did not ask any compensantion to the countess. A gift of piety, in fact, meant to heal and reduce the horrors of war, rather than to aid in battle, for the blankets only allow for slow recuperation rather than immediate healing.
He also says that he dealt with the countess under his persona of Antonio, a Venitian merchant with no ties to the Order, claiming to have acquired the blankets through trade with the Levant -- so it should not count in any way as direct sale, acting as a court wizard, or even intereference with mundanes (based on the numerous precedents that a magus can even fight against mundanes, as long as he does so in a mundane identity).
Finally, Prospero points out that the blankets are not magical items. Instead, each is simply inscribed with a Ring Duration, Circle spell that aids the recuperation of anyone resting within the Ring. He also notes that the effect will eventually fail due to the natural wear and tear of the blankets.