There are 3 achievements related to this location. The other two are found in spoilers.
First achievement
*** Spoiler - click to reveal ***The clue is obtained at the very first location: Juan Garcia's Cruz's house.
Upon arriving you'll enter a shootout. If you use the back door you can obtain another achievement:
Second achievement (voids getting 5 star rating for this case)
*** Spoiler - click to reveal ***After the shootout look at the Newspaper that is found in the backroom that functions as a bedroom.
From the front entrance that is straight, right and then left and then in the back right corner of the room. Tilt the newspaper to find the location. When you're done, head to the location and get your achievement. Note that pursuing this achievement will void getting 5 stars for the Reefer Madness case.
This achievement:
Go outside to the back of the house to find a shed. On the left there will be 5 Flour cans spread across 3 shelves. There are 4 yellow ones and 1 more white. Grab the white one to open a secret room. In the secret room there is a canopener attached to a cabinet. To the right of the can opener are two cans. Open both and get: