Belkar Bitterleaf used to carry around a sheet of lead which he used to protect from paladin's Detect Evil spells, claiming it was part of halfling culture (first used 202). It was lost in Azure City, and seen (strip 779) being used by Niu to block a hobgoblin cleric's Detect Good spell.
Bitterleaf, Belkar (plaintiff) Vs. Miko Miyazaki, Paladin of Azure City (defendant) (begins strip 228)
The use of the lead sheet, ostensibly a matter of halfling culture, was also employed as part of a legal defense by the two attorneys (Mr Jones and Mr Rodriguez). Their case had two parts. The first argument against Miko's Detect Evil ability was that it may be harmful, partially because the lead sheet blocks both it and harmful radiation, and partially because many of the monsters that Miko had subjected to the spell had since died. (Miko rebutted that the monsters only died because they scanned as evil, and Miko had summarily executed them, but Mr. Rodriguez viewed that as better evidence in favor of his argument than against it.) The second part of Bitterleaf's defense was on grounds of privacy. As free people, and even as prisoners, Bitterleaf still had a right to privacy and protection against illegal searches.
A conflict with Bitterleaf's legal counsel erupted when one of them attempted serving a restraining order on Bitterleaf in strip 230. The attorneys instead worked for the prosecution in the court at Azure City. During the trial, Belkar Bitterleaf and Miko Myazaki both fought. Eventually giving in to the temptation to use the lead sheet, she attempted to use detect evil. Belkar blocked the attempted scan with the lead sheet and hit her with it while remarking that it was worth the weight encumbrances (strip 281).