>> this is a blood stain card from trayvon martin. >> let me show you state exhibit 188. i ask you if you recognize that, sir? >> i do. the outer package has our fdle bar code label, my initials the day i opened the package, the internal packages with the swab also have my initials and the date. >> what is that, sir? . >> this would be a buckle swab taken from george zimmerman, swabs taken from the inside of the mouth. >> may i show that to the jury, your honor? >> yes, you may. all this writing on here