Smuggling Drugs Into Space

Can you believe the nerve of some drug runners? They found crack (Note: the title of the story was ‘Crack Found in Space Shuttle Foam’ before – honestly!!) stashed on the space shuttle. I’m curious to know how they got the crack into the foam. I found out that this isn’t the first smuggling operation with big plans. Drugs have also been found:

How do they find these? Are there drug sniffing dogs that patrol the space shuttle? What about the one on the ocean floor? Do they train dolphins to find drugs or was it just blind luck that they stumbled across it during a routine submarine patrol? Also, how much demand for drugs is there in space?