reference will now be made in detail to the preferred embodiments of the present invention , examples of which are illustrated in the accompanying drawing , wherein like reference numerals refer to like elements throughout . cell material , which has accumulated on the walls or at the bottom of the sampler by respiratory air and respiratory aerosols condensing out , is removed from the sampler by flushing the system or by suction of the sample and , after cell disruption and the pcr , is delivered directly to the dna analysis system . reagents may already be added to the sample . the sample reception system may be used independently of the dna analysis system , or may be coupled directly to the analysis system . very high reliability by dna analysis , non - invasive method , which is straightforward to handle , high acceptance when using exhaled air or saliva for the examination , in contrast for example to blood samples and swabs , improvement of the person identification in respect of security by dna analysis , simple compact mobile sensor system , improvement in the practicability of such an examination since it can be carried out rapidly , inexpensive method when using electrical biosensors . the persons to be identified 1 blow into a flexible sampling system 2 in order to collect the required cell material from the exhaled air 7 . by continuously blowing , cells or cell fragments are also exhaled by breath aerosols besides or in biological components of the exhaled air 7 . these are deposited on the walls of the sampling system by condensation of the respired air . the blowing into the sampling system must be configured so that the exhalate or saliva contains the required number of cells . this may optionally be done using a controller which determines the collection time or the collection volume . one possible configuration of the sampling system may be a collection tube with a cold trap 3 , so that the exhaled air condensate is already pre - collected , or only a simple small tube without a cold trap . either this sampling system is flexible and independent of the dna sensor system , and can therefore be used in a mobile fashion and directly in situ , or it is connected directly to the sensor system 4 . after the sampling , the sampling system is coupled to the dna analysis system and the sample is delivered to the analysis system by flushing or suction . if the sampling system is already coupled to the dna sensor system 4 in a fixed fashion , the delivery of the sample is carried out by a connected pump or suction device . during the sample transfer 9 , the sample may already be supplemented with reagents which are required for the dna analysis ( for example cell lysis medium ). the dna analysis is then carried out by the dna sensor system . optical dna sensors , for example using fluorescence , chemiluminescence , spr ( surface plasmon resonance ) or electrical dna sensors , for example amperometric , potentiometric , or microgravimetric dna sensors ( piezoelectric , quartz micro - balances ) may be used for the dna analytics . a simple and economical configuration of the sensor system can be achieved by employing electrochemical dna chips . by integrating the complete system , i . e . cell disruption and sample purification , pcr ( polymerase chain reaction ), fragment analysis , hybridization and signal readout on a so - called “ lab on a chip ”, a very easily handleable mobile instrument is made available and usable . the dna data thus obtained from the dna fragment analysis are subsequently compared 10 with a dna database 5 in order to carry out the identification of the person . depending on the application range , this database may contain only the dna data of a selected group of people , or it may be linked with a central database when general person identification is required , for example in security checks at airports . the local database is conventionally stored in the instrument , while access to a central database takes place via a radio connection or via a wired network , for example the internet . security of the data matching must be ensured by it security management , likewise the data protection of the persons . in the drawings , reference numeral 6 represents an output or display . the invention has been described in detail with particular reference to preferred embodiments thereof and examples , but it will be understood that variations and modifications can be effected within the spirit and scope of the invention covered by the claims which may include the phrase “ at least one of a , b and c ” as an alternative expression that means one or more of a , b and c may be used , contrary to the holding in superguide v . directv , 69 uspq2d 1865 ( fed . cir . 2004 ).