Posted By:
Kevin Saucier
I don't think any major auction house will subject themselves to anymore costs, plus the invitation to information they may not want to hear. IMO they think if it's in a legitimate holder then everything has already been done. Funny but if they were to offer work, it would probably be from the dark side (LOL).
Unfortunately, I see a lot of material that has been sold at auction that is holdered and has been altered. Sometimes you can actually see corners that were pressed.
Marc is correct, PSA will not consider hiring anyone just for alteration detection. Since I only live about 20 miles away and was looking for a career change anyways, I actually tried to join their senior team but was rejected at the email stage...oh well.
I consider Mike Baker a very good friend, both in the hobby and personal. I understand has taken the bull by the horns and is now grading most if not all cards himself. He admits one can never know too much and is always willing to sit down and take doctoring lessons. He gets the "full meal deal" how-to's, formulas and step by step break-downs of exactly what to look for...however subtle it may be. IMO he now knows more about card doctoring than most, on top of being known for his grading skills. If I'm not playing the PSA registry game and since I only collect and don't sell, I only trust Baker to personally grade my cards. I promised long ago to never try and get a doctored test card by Global. Actually he waived the white flag years ago (LOL). Almost all my altered cards are there now and have been slabbed as "doctored" and will be traveling with them to show collectors what to look out for. A scan is one thing but seeing it in person is a different story.
Leon is also correct, some card doctors are well past any and all graders. Like he said, everyone will make mistakes but when they become repetitive it becomes a problem.
Sorry but I don't know enough about SGC to make an educated judgment. That's not to say they haven't been tested as well 
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Kevin Saucier