I would like to further clarify my opinion as well, since after talking about it to some people privately I found some sources of confusion.
Firstly, I am not wishing to remove the ability of the police to go undercover, and hence to commit certain crimes (possession of drugs, for example, in such an undercover investigation) in pursuit of a suspect. Why? Because any crime a cop would catch someone doing (barring the entrapment issue, please) is essentially a crime any other person could reasonably perceive. So while I might buy that an undercover cop could present himself as a lawyer and read the contents of an envelope, it is still not reasonable to assume that whoever I send a letter to could collect DNA samples from the seal. (What if they posed as a health care professional and drew blood?.. hmm…)
Secondly, the trash issue. Clearly the trashman has pretty unlimited access to garbage, and people sort through other people’s rubbish all the time. Should someone stumble upon a razorblade with white powder on it, or a carbon-coated spoon and a syringe, they could reasonably have suspicion that whoever put this in the trash was or knew a drug user. Compare this to collecting hair samples for DNA testing—am I really asking the police to “avert their eyes from evidence of criminal activity”? No, unless one presupposes what the DNA tests are collected with hopes of demonstrating. Get a warrant to search my premises and find all the DNA you want.
Third, the envelope issue. First, I find it nearly preposterous that the seal of an envelope is somehow not part of the private nature of the contents. Certainly the address must be public, as would any fingerprint evidence on the surface; however, the seal and beyond is what is there to, ostensibly, protect the private nature of the communication. One cannot compromise the seal without compromising the contents; at least, not without “he said she said” styled, “But I didn’t look at them, I swear!” Furthermore, the use of the seal to obtain DNA samples calls back to the second point above in that it is not reasonable to assume that every time I lick an envelope “just anyone” could collect samples and test them. Perhaps in the future this would be more common (hello, Gattaca), but now? —I don’t think so.
The issue hinges around reasonable expectations of privacy; while in public, I expect it completely possible that someone could
- make an audio tape of anything I say;
- see me going where I go;
- videotape my actions, even if I attempt to obfuscate them;
- ask people about my whereabouts;
- collect and sort my refuse;
- among other things.
None of which involves fingerprinting or DNA evidence. I have some leniency on the fingerprint issue, since it is possible for me to wear gloves all the time. Still, fingerprinting technology is not drugstore material, while voice recorders and disposable cameras are, and video surveillance is fairly ubiquitous, nevermind people who will simply see things and remember them.
Finally, the crucial difference, to me, between undercover evidence gathering I find appropriate and undercover evidence gathering I don’t is that one type of evidence is indicative of a crime (eg, found syringes or seeing me hand over money in exchange for a contract on someone’s life) while the DNA/fingerprint issue is evidence used to link me to a crime that is not simply a matter of jotting down public information (ie, something “just anyone” could do). I think there is very clearly a category difference between the types of evidence, and I feel that the category difference fails to be blanketed under the decision of California vs Greenwood (that I read, linked above).
It would not be a matter of telling cops to turn a blind eye to what is staring them right in the face. It is asking them to obtain warrants for evidence that is
- not at crime scenes, and
- not staring just anyone in the face.