Currently, warm-blooded pets are allowed to enter the country only if they have a certificate showing that they have been vaccinated against rabies  This policy is flawed because vaccinations sometimes fail to take effect  If the vaccination is successful, the animal has a high level of rabies antibodies in its blood
Ttherefore, a more effective means of preventing pets with rabies from entering the country would be to administer blood tests and refuse entry to any pets whose blood did not contain a high level of rabies antibodies
There is no way to distinguish between high antibody levels caused by active infection and high levels caused by successful immunization.