A condominium tower in Florida has a mess on its hands: Some residents are not cleaning up after their pooches. So the building's proprietors are turning to doggie DNA testing to root out the culprits and hand hefty fines to their owners. The Vue plans to launch the testing next month to determine who is leaving their dogs' droppings around a pet park on the tower's seventh floor. Half of the residents have at least one pet. "The only way to handle this is usually to do DNA testing and then fining owners US$100 per offence," said Cristian Michaels, who oversees sales and marketing for the Vue. "Renters with multiple violations can be evicted by the association." The Vue and several other complexes in the Orlando area have a contract with PooPrints, a division of BioPet Vet Lab in Knoxville, Tennessee. The testing has been in place for several months at about a half-dozen Miami-area condominium and apartment complexes, and has put an end to some unseemly situations, such as dog excrement left in lifts, said Pauline Gordon, Florida distributor for PooPrints. Since PooPrints was launched in 2010, about 300 apartments, condominiums and homeowner associations in 33 states have contracted the service. And now, some cities and dog parks had begun inquiring about the programme, said Eric Mayer, director of business development for the company. Here is how it works: Someone swabs the interior of dogs' mouths, and the saliva samples are sent to a laboratory. The properties of the DNA samples are recorded and can be tested against faecal samples collected when residents fail to pick up the pets' droppings. The concept originated with research scientists working at the veterinary school of the University of Tennessee. When it was introduced, people were concerned about the intrusiveness of the system, but now they are more concerned about being first in their area to try it, and about the cost. The initial cost of registering a pet is US$30 to US$50, depending on the location.