Law (see Morlok, in: Dreier, GG, Vol. 2, 2nd ed. 2006, Art. 38, marginal no. 127), and hence the decision on deployment of voting machines and the determination of the more detailed preconditions for their deployment. Details may be regulated by means of a legal ordinance on the basis of a statutory authorisation (see Magiera, in: Sachs, GG, 5th ed. 2009, Art. 38, marginal no. 114). The legislature is entitled to broad latitude when lending concrete shape to the principles of electoral law within which it must decide whether and to what degree deviations from individual principles of electoral law are justified in the interest of the uniformity of the entire election system and to ensure the state policy goals which they pursue (see BVerfGE 3, 19 (24-25); 59, 119 (124); 95, 335 (349)). The Federal Constitutional Court only reviews whether the legislature has remained within the boundaries of the latitude granted to it by the Basic Law, or whether it has violated a valid constitutional election principle by overstepping these boundaries. It is not a matter for the Court to find whether the legislature has found solutions which are expedient or desired in terms of legal policy within the latitude to which it is entitled (see BVerfGE 59, 119 (125)). 117 3. The deployment of voting machines which record the voters’ votes in electronic form and ascertain the result of the election electronically is hence only compatible with the Basic Law subject to strict preconditions. 118 a) When electronic voting machines are deployed, it must be possible to check the essential steps in the election act and in the ascertainment of the results reliably and without special expert knowledge. 119 The necessity of such monitoring emerges not lastly from the susceptibility to manipulation of electronic voting machines and their amenability to error. In these, the acceptance of the voters’ votes and the calculation of the election result is based on a calculation act which cannot be examined from outside or by persons without special computer knowledge. Errors in the voting machine software are hence difficult to recognise. Over and above this, such errors can affect not only one individual election computer, but all the devices used. Whilst manipulations or election falsifications are virtually impossible in classical elections with voting slips under the conditions of the valid provisions, including the provisions on the public nature of elections – or at least are only possible with considerable effort and with a very high risk of discovery which has a preventive impact – a major impact may in principle be achieved with relatively little effort by encroachments on electronically controlled voting machines. Manipulations of individual voting machines can already influence not only individual voters’ votes, but all votes cast with the aid of this device. The scope of the election errors which are caused by alterations and malfunctions of a single software program affecting multiple devices is even wider. The major scope of the effect of possible errors in the voting machines or targeted election falsifications requires special precautions to be taken in order to comply with the principle of the public nature of elections. 120 aa) The voter himself or herself must be able to verify – also without a more detailed 121 25/37