There is ZERO excuse for any breeder large or small not to test their breeding/cloning stock for HpLVd. OF COURSE Tumi (and other labs) recommend you test each keeper plant 5 times total to ensure it's viroid free-their business model depends on selling tests. It's the same reason following fertilizer feeding schedules will burn your plants-they want to sell more product. Testing more than once makes sense because of the way the viroid travels through the plant-it's entirely possible to have a newly infected plant with low viroid levels, pass the viroid on through a cut, which now also has low viroid levels. If you buy that cut and test it immediately, it might show up negative. Allowing that cut to grow for a month or two before testing will likely give you a more accurate result. BUT, if you do that, you need to be confident in your biocontrol procedures and not expose other plants to the plant in quarantine. At $25/test, everyone who sells clones/seeds should test their stock at least twice, with a month or two between tests. Ideally they should do exactly as Tumi says, especially if they have employees who might slack on procedure.