EFFECTIVE IMMEDIATELY, for all Ministry personnel:

All Ministry employees and visitors to the Ministry must keep their left arms exposed at all times. Those lacking left arms must keep their right arms exposed. The armless must keep their legs exposed to the knee. Quadruple amputees will be permitted to remain fully dressed, but watched closely.

The aforementioned areas will be both magically inspected and Scoured to remove any concealments. Those pleading medical conditions which might render such inspections harmful will have to conduct Ministry business via owl.

Any wizards or witches found to be carrying the Dark Mark will be detained in Ministry cells without bail for an indefinite period of time. Pending determination of whether the Dark Mark can only be taken voluntarily, they will not be mistreated; however, under Emergency War Provision 455-PU11, their residences will be searched and acquaintances will be questioned nonetheless, in an effort to discover what crimes they may have committed under Imperius.

Under absolutely no circumstances will a Marked individual be allowed to leave imprisonment until the end of the war. Ministry personnel found to have assisted the escape of a Marked individual will be treated as though they themselves were Marked.

The Ministry will neither confirm nor deny plans to implement similar procedures elsewhere.

There will be no exceptions. If the Minister were found to be Marked, the Minister would be arrested and held indefinitely. If the Chief Warlock of the Wizengamot refused to bare his arms, he would be barred from the Ministry. Visitors refusing to comply must be turned away; visitors attempting to force entry must be subdued by force. Guards permitting entry of visitors or personnel in violation of this decree must be assumed to be under the Imperius.

Agents of He-Who-Must-Not-Be-Named, voluntary or otherwise, shall not be permitted to treat this Ministry as their playground any longer.

Author's Note: I am thoroughly bemused at how the Ministry can suddenly shift into authoritarian-lunatic mode at a moment's notice while never addressing the issue of the Dark Mark. It's never shown to have any feature for concealment. It's not as though it's in an inappropriate place, either; all one has to do is ask the suspect to roll up their sleeve.

I hoped it was just fanon (including mine, I admit), but no: Pottermore says "[The Death Eaters who arrived at the Little Hangleton graveyard] were just the ones who avoided Azkaban and, presumably, spent 13 years hiding their arms." How? Why? Are left forearms secretly erogenous zones for wizards, such that being asked to roll up your sleeve for five seconds is a grossly indecent proposal? Are you only supposed to show it to your spouse? Is the Pureblood birth rate (outside the Weasleys) so low because Purebloods think only Muggles reproduce via intercourse, and good Wizarding folk conceive by rubbing forearms with their spouses? So many questions.

Left the decree ambiguous as to whether it was set during the First or Second War, because it could work in either.