spencer didn't technically pawn the ring. she had plans of going back and retreiving the ring she was just using it to get a loan, even though it seemed suspcious, why would she go under the pretense of picking it back up she would have just sold it and gotten much more money. and plus if she wasn't planning on picking it up A going and buying the ring wouldn't have been a big deal. i think the show is making a huge mistake not revealing A till the series finale. they can't stretch it out that long. they need to take from the books and do more than one A, they could even make it that there were two As all along (unlike the books where it was one then the other) and they find out one soon and the other at the end! but they can't drag the A mystery out the whole series if they wanna make the show last for any period of time.
for all those who don't think deb would find out about dexter and be okay with it, you should know, if you don't already, that in the books she finds out and is in fact ok with it. deb mayb be a hard core bad ass do gooding cop but she is able to understand that type of motivation. cops kill the bad guys all the time, or the bad guy just gets to sit and jail and have a blast. dexter does what needs to be done and deb would understand it!