Chrome management, Blocking users from signing into different accounts via the page

We have an google educational domain with managed chromebooks.

While we do block students from signing into the cromebooks with any other domain, students are still able to open up chrome and sign in with personal gmail accounts.

I don't think there is anything to be done about this, as we need google open on a firewall / content filter level, and they are just using the website.

However I thought i would throw it out there, maybe someone else has a clever solution.
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Jaime LewisMarketing Account ManagerCommented:
What version of Chrome are you using? For anything higher than Chrome 37, you can block multiple sign-in access from the Google Admin console.

Device Management>Chrome>User Settings>Multiple Sign-In Access

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