this assumes that there are two wiretaps, and that the ECM hides visits.
Day 1, night 1, day 2
nothing relevant to the scenario
Night 2
"[You] is configuring the wiretaps." in mafia chat
Day 3
You are now reading every single PM. You see the following PMs:
[??>??] ??: I tried to shoot ## but he was immune.
[??>??] ??: hey dude i found out you are sheriff. Im investigator. Wanna team up? We will get # tonight.
So you deduce that a vigilante tried to shoot a double-digit guy and failed.
You also deduce that an investigator and a sheriff are teaming up to investigate a single-digit guy.
Night 3
"[You] is configuring the wiretaps." in mafia chat
Day 4
The mayor reveals.
You get to see what role claims are being thrown around. Not all of the PMs are to the mayor, but you can safely assume that a majority of them are.
But you notice this in particular:
[??>??] ??: spy n# # killed, ## and # visited n# ## killed got shot by vig but healed
So you prepare the ECM jammer. Your mafia mates, the Godfather and the Disguiser, see this message:
[You] is preparing an ECM jammer for the night!
The mayor ends up lynching an investigator claim, the same guy that found the sheriff. The sheriff is revealed to be 10.
Night 4
You are out of wiretaps.
First message to show up in mafia chat for the mafia is:
"The infiltrator/eavesdropper has deployed an ECM jammer. No one will be able to intercept our communications tonight."
Spy will not know that an ECM jammer is in effect. He will just see an empty chat and assume mafia are just staying silent.
So now yall discuss what to do next.
You know that the spy is a double-digit guy. There are three possible people with double digit numbers excluding the proven sheriff: 11, 14, 15.
You know exactly who the sheriff is. 10.
With the spy threat gone for the night, you and the mafia thoroughly discuss the plans for the rest of the game, such as the amount of bodyguard claims and the likely matches, knowing full well there will never be another chance for completely private communication.
All of you deduce that the spy is one of three people still alive. The godfather is coming to kill 11 tonight.
You tell the disguiser how 10 speaks, and tell him to copy the LW of the sheriff. The disguiser is coming to kill 10 tonight.
And you get ready to become a Mafioso in the morning now that both your wiretaps and your ECM are used up.
GF gets witched to 5.
Day 5.
You are now a mafioso.
4, the disguiser's first identity, is apparently killed by mafia but is cleaned. "10", his new identity, is sending the mayor a sheriff LW that shows you as innocent.
5 is dead. He was the Vig.
Mayor puts up 14.
14 claims spy on trial and reports that the mafia was a little bit talkative the first 3 nights but became dead silent night 4.
14 also claims that on night 4, all he saw was 11 dying to mafia. He didn't see 10 get disguised.
Mayor proclaims gulity and the town follows.
14 the Spy is mislynched.
Now mafia can freely speak the rest of the game without the ECM, which was only one-use.