content: Don't use corporate devices to make the recordings or for documenting all this. These can be confiscated suddenly, at any time. Then you'd lose your evidence. If recording a conversation on your phone, again, better to use a private phone rather than a company one. They can possibly remotely access it and/or wipe it. Make multiple copies of everything and save it on personal devices (e.g. copy the phone recordings to you PC). I'd even back it up to thumb drives and store them hidden. Some of these guys will go to far & wide lengths to keep this stuff from coming out. Such as even having a "friend" coworker pay a visit to your home to sabotage or recover such evidence (steal devices). These guys are evil and totally corrupt and can't be trusted at all.