It’s worth noting that in Italy, police communications are encrypted (they use TETRA radios, like most police forces in Europe). I’m not saying it can’t help prevent this, but when weighing the cost and benefits of encryption for police radios, we should take into account that this benefit is not absolute.
Oxygen is found in 3 forms: nascent (O), molecular (O2, the most common) and ozone (O3). Nascent oxygen, due to its electronic configuration (i.e how many electrons it has and how they’re spread out across its electronic shells) is unstable, and tends to quickly form bonds with another O, forming O2. This is also the case e.g. for hydrogen, which is usually found as H2.
You can find O in this form in some environments, in the upper atmosphere there is enough UV radiation to break up O2 into O.
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