Upton also alleged in the declaration posted on TMZ.com that a dermatologist and licensed doctor at UCLA Medical Center examined her daughter Wednesday, concluding, that "the results indicated that she has not ever received treatments including botox or other such injections."
ABC News confirmed that Britney did see a doctor who looked for any physical signs of a botox procedure. The results of those tests have not been made public.
The effects of botulinum toxin, known as botox, typically last between three and four months, according to experts, during which time the muscle groups that were injected could be tested with a nerve stimulator to see if they contract. If there is no contraction or diminished contraction, then the muscle has likely been treated with botox within the last three months.
In the ABC News interview, Upton claimed the last injection was about three months ago. Given that time frame, experts say, it is difficult to conclusively determine whether botox had been administered.
"It is extremely unlikely that you would see any effect from the botox at this point in time. Her muscle movement would be back completely and there is certainly no blood test that could determine if she had botox before," Dr. Ava Shamban, a dermatologist, told ABC News.
The Food and Drug Administration has not approved the use of botox on children for cosmetic purposes. While the drug is generally safe, dermatologists worry about the potential for both emotional and physical damage of administering botox to children.