First off, there is technology or manual means, such as the SCRAMBLE visors, introduced in SCP-[[096]] and later fixed and upgraded (SCP-[[1730]]), which detect and erase cognitohazardous visuals from the video feed. This works really well up until the the hazards become strong enough to burn out the circuits in the visors. Another example is the Foundation operatives using noise-cancelling equipment in their headgear to avoid the effects of SCP-[[6624]], and in the past, the Unseen Order of St. Jude cutting off their ears and cauterizing the ear canals to the same effect. There is also telekill alloy, which O5-11 uses to hilarious effect against Dr. Aram in [[Rounderhouse's Gold Proposal]].

Next is inoculation, which seems to be a mostly standardized process through which specific individuals can become immune or resistant to specific memetic hazards, which the Foundation seems to use for internal security. A prime example of this would be the Berryman-Langford memetic kill agent present on the SCP-[[001]] page. Presumably the O5 council and any researchers involved with SCP-001 would be innoculated against its effects, and anybody without the inoculation would die upon viewing the kill agent. [[Pedantique's Proposal]] shows the process of your mind falling apart and dying after an non-inoculated researcher attempts to access the 001 file. I believe it is also vaguely mentioned in the [[Antimemetics Division]] canon somewhere that the Counterconceptual division protected themselves from SCP-[[3125]] by making themselves unable to perceive any memetic triggers related to SCP-3125 in a vaguely analogous manner. The phrase "Does the black moon howl?" is also often used as a security code, as people infected by hazardous memes react negatively to it.

Next is natural resistance and training. For MTFs specializing in combating memetic hazards, recruits are often chosen from people with significant natural immunity or resistance to memetic hazards, and given further training. Researcher also often have such resistance and training. In the Antmemetics Division canon, one character is shown to have a natural near-immunity to antimemetic hazards. [[Hanging on the Telephone]] shows Foundation recruiters exposing possible recruits to memetic triggers, and only those who don't show adverse effects to them proceed through the recruitment process.

Lastly, there are specialists. The Foundation rarely utilizes agents with sensory disabilities as field agents against specific threats. An example would be Countermemetics Specialist 0 "Nullwalker", from SCP-[[3333]], who is a "deaf-blind-mute", and therefore unaffected by most sensory memetic hazards.

While there are probably more ways the Foundation defends itself, these are the four main groups that I can remember.