Abstract: A system for a tamperproof seal having a cap assembly and a bottle assembly is disclosed. The bottle assembly includes a bottle with a neck and bottle threads. The cap assembly includes a cap with a top portion and a bottom portion which engage the neck of the bottle. Between the top and bottom portion there is a seal created. The seal is initially intact and only broken once the top and bottom portion are separated. The seal cannot be replaced once it has been broken. If the seal is broken reaching the intended party, then tampering occurred. The top portion may be removably mounted to the bottle. The top portion includes inner threads that engage the bottle threads. The bottom portion includes inner teeth angled towards each other which engage the bottommost of bottle threads. Inner teeth prevent the replacing of the cap once the seal is broken.