Should drives with credit cards info be returned, or what?

Normally, seized drives from business computers are returned to owner after forensic examination is over and no incriminating data is present.

However, if suspect drive contains child porn images, - as you know having these images alone is a crime-, then drives should not be returned to the owner. The same rule applies to seized hard drives that contain hundreds of credit cards numbers.

So, how does system work in your country? Do judges ask you to wipe these drives after trial and return the original drive to the owner? Or does the drive is kept forever and a new drive is bought for the company?

Or what?

Thanks