The JTAG process is very safe if you do the process right. The boxes that we use to JTAG phones are meant to program/unlock from service provider/erase phones and selecting any of these options in the interface will alter the data on the phone. Just like the Flasher boxes did, these tools function the same way.
The JTAG process allows you to grab a physical dump from the memory on the phone. This dump helps you in two ways: one, it allows you to use the CCL Scripts (or Cellebrite PA/XACT) to carve out the pattern lock; two, you have a physical dump of the phone's memory that includes the deleted items easily decoded using HEX Editors.
Once you have the passcode from the CCL Scripts, you can then unlock the phone, turn on USB Debugging and then acquire the phone using any of the forensic tools that support the phone.
The first JTAG training class will be presented in the UK in April/May of 2013, watch for dates on the Teel Technologies website.
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