I've been trying to think of simple subjects that I could write blog posts about and solving a minor issue I was having earlier today led to some inspiration.
I had created a custom form, completely functional outside of Mura's built-in validation so when I submitted the form it didn't matter if I checked the "I'm not a robot" checkbox or not. Including reCAPTCHA is the same as if you were creating a "Simple Form" in the Mura admin.
Mura uses a method in its "Utility" bean to verify submissions and makes integrating anywhere within your own custom code a snap.
Check out my Gist for more information.