Actually, a type of urine test called an RIA (radioimmunoassay) is the only way to detect previous LSD use. It uses radioactive iodine to detect metabolites, since LSD itself actually breaks down within an hour or two of ingestion, and produces radioactive waste--making it costly. Those metabolites are only present for up to two days following the last time you used acid. The government (US military) and only a few private labs use this testing on personel. That said, you have nothing to worry about.
You can detect LSD in a urine sample up to about 72 hours after ingestion, sometimes it'll be gone by 24 hours. You can get weed out of your system that fast if you've only smoked once, but it accumulates pretty quickly.
^The key word here is 'metabolites.' Metabolites are the by-products created when the body breaks down a chemical--in this case, LSD.
Your giveing this boy uselss facts, which he dosnt need to know, at this moment... And why wouldn't it be a smart more to shave your head?
Here. . .I'm done trying to explain something you clearly won't understand. http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12423010&dopt=Abstract and no, don't shave your head. LSD use can't be detected through hair analysis.
http://www.clinchem.org/cgi/content/full/44/2/287 http://www.tiaft.org/tiaft2001/lectures/l26_grobosch.doc
