Some thoughts and questions about Gale's Case File and the Evidence:

1.   Why does the file photo / news article photo of Gale look like a Mug Shot?

2.  Gale's cell phone... surely the police would be investigating that... and discover it received a call from Mike at the time that Gale was being shot... although Mike can destroy his phone - he did speed dial Gale..  Wouldn't Gale's phone have identified the caller if Gale has Mike in memory on his phone?   Same thing with Walt.  Walt and Jesse have each other in memory on their mobile phones...  doesn't it stand to reason that as Walt's assistant, Walt would be on Gale's phone and vice-versa?  I'm sure Hank's cop buddy investigating the murder would pick up on a Walt (or even a W.W.?) on Gale's phone, particularly since he assisted Hank and the Whites in trying to find Walt when he went “missing”.  Also, who else is in Gale's phone memory?  
Some people dismiss this by saying that they are using prepaid / disposable phones, but even with prepaid / disposable phones... They all have each other on speed dial... which means they all have to reprogram whenever 1 person changes phones... so they must use Names or codes or something to remember who is who in their phone memory. So the Police have Gale's phone and can see whoever he has in memory (by name / code / whatever). Even if everyone on his contact list has destroyed their phones, the police can find out what numbers Gale has had calls with, when the calls were made, and geographically where they were placed from... at the very least to within a cell (area served by a cell tower), and perhaps more accurately (I'm no phone technician, but I am sure they can track calls at least to within a "cell"). If I was investigating the murder, I would definitely be looking at all the records for, and on Gale's phone, particularly the call that was placed when he was being killed

3.  The Lab Notes... could they maybe trace the lab / laundromat from this?  On page 2 there is a "Cat List" which lists several companies, I assume lab equipment suppliers.  Wouldn't the police contact these companies to see who in Albuquerque has purchased from them in the past year?   And... One in particular....Madrigal Electromotive is listed...  guess what? ... In season 3 we saw that Los Pollos Hermanos is a registered trademark of Madrigal Electromotive GmbH.  (GmbH indicates a German company).  
http://breakingbad.wikia.com/wiki/Los_Pollos_Hermanos

Could that lead the police to Gus?  Are they following this information up, or is that a DEA responsibility?  Could the laundry be linked to this as well?

Other notations could be used to trace a purchase... on page three Gale references a catalogue item "P.17 Item 5" as a potential for use as the settling tank.  Also on Page 7 Gale gives the weight of the settling tank as 2100 lbs.

On page 6 “Either move the laundry facility 14' north or switch the filters & the finishing tank".   This gives the clue of laundry... although that alone doesn't indicate laundromat or industrial laundry... what is interesting though is that the diagram above this shows the filters / settling tank with arrows indicating they could be switched.   No indication of "laundry" in the diagram.   So a bright investigator might assume that the laundry is either below or above (more likely above from the notes on page 7) this in order for it to some way interfere with this equipment.  The point is... this could potentially lead investigators to look into laundries.
Page 7 adds to this...  "Entry Above" indicates that the lab is under something.  As well as the indication of the Freight elevator.   The bullet points at the top of this page also indicate that some facility exists where this is being constructed... "Not connected to existing" talking about spill drainage.

Also, I find it hard to read at the top bullet from the list on page 7....does it say "Bfor Gus In"   ??  Maybe meaning "Before Gus Comes in"...??

Now after the 5'th episode "Shotgun" we have the addition of the Napkin from Los Pollos Hermanos, along with MI-MB042266-GER handwritten on it.  (This was found on the coffee table in Gale’s apartment according to the crime scene photos).   On comparison to the "Lab Notes" it is pretty clear that this is not in Gale's handwriting.   My thoughts run again back to Madrigal Electromotive.... which is a German Corporation (hence the GER)... and this starts with the Letter "M" (Madrigal)...  could it be a catalogue / model number or invoice number for some piece of lab equipment purchased from Madrigal Electromotive for the Super Lab?   I really am leaning towards this answer.  
Another popular idea on this is that it is an account number for an offshore account, although I am not as convinced of this.