knew that all the mail that comes into the mailroom is opened by a machine. they cut the top of the envelopes. what this person did, they took small doses of black tar heroin and put it along the glue fold of the envelope and simply sealed it with a greeting card. >> jim dejenet is a veteran member of the pelican bay security quad. he has witnessed some wide range smuggling attempts, some nearly impossible to detect. >> okay. we'll take that with us. >> the traffickers on the street, they took methamphetamine and they applied it to the paper. every place where you see color ink, that's all thick methamphetamine. and they let that dry. and then after it dried, they put food coloring on top of the methamphetamine so it looks like grass, a plant, the sun and then they write a little note here, like a kid would write. and it says, "con mucho amore," "with much love" and addressed it to the person that was supposed to get the methamphetamine drawing. we received two of them just like this.