Specifically, Avast, since that's the one I use.
I've tried Googling this, but I can only find pages talking about Antivirus software for Android. I have got one of those (Lookout), but would be more reassured if I could be reasonably certain an app is clean before letting it near the OS it targets.
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"My name is Ezio Auditore da Firenze, and like my father before me, I am an accountant"
Nothing is true. Everything is tax-deductible