recommend something that allows me to spy on WhatsApp messages

I know one of my employees is leaking critical information via whatsapp messenger. I only needs proof now! Can anyone recommend something that allows me to spy on his WhatsApp messages?

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• Spy on SMS, WhatsApp Msg
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iKeyMonitor records all WhatsApp messages on the phone and sends all logs to appointed email or FTP address, so you can remotely monitor all things your employees do with their WhatsApp Messenger.